The chemical symbol for Californium is Cf. Found inside – Page 85The MA1 center was found with S = 1/2 and the HFS from one phosphorus atom. ... The energy barrier arises as a result of strain around the phosphorus atom having a large atomic radius. It is interesting to note that the NP1–NP3 centers ... 34 percent ionic, 66 percent covalent, 179 pm. Platinum is one of the least reactive metals. The phosphor has a total of 15 electrons whose distribution is as follows: In the first layer it has 2 electrons, in the second it has 8 electrons and in its third layer it has 5 electrons. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. The chemical symbol for Mendelevium is Md. The chemical symbol for Cadmium is Cd. Phosphorus P (Element 15) of Periodic Table. The Van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Down a group, atomic radius increases. เนื้อหาหลักสูตรแผนการเรียนการสอนวิชาภาษาไทย Also some applications for it and some of its compounds which glow in the dark. 16 Why is the ionic radius of K+ smaller than CL? Because of that, we can say that the atomic number represents the positive charge of the atom. In nuclear reactors, promethium equilibrium exists in power operation. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. The chemical symbol for Chromium is Cr. Trends in atomic radius down a group. The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. Thulium is an easily workable metal with a bright silvery-gray luster. The chemical symbol for Silicon is Si. Mini-video on ion size. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. The classical description cannot be used to describe things on the atomic scale. Find an answer to your question Phosphorus atomic radius is smaller than magnesium atomic radius True or false nuacnu59jq nuacnu59jq 09/29/2020 Chemistry High School answered Phosphorus atomic radius is smaller than magnesium atomic radius True or false 1 See answer Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. Samarium. The chemical symbol for Praseodymium is Pr. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Its extreme rarity in the Earth’s crust, comparable to that of platinum. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Found insideElementAtomic Radius (Å) Ionic Radius (Å) Ne 0.38 N/A P 0.98 1.00 Zn 1.42 1.35 14. The phosphorus ion is larger than a neutral phosphorus atom, yet a zinc ion is smaller than a neutral zinc atom. Which of the following statements best ... The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. 113Cd has specific absorption cross-section. Answer (1 of 4): There are many elements that have an atomic radius greater than phosphorus (P, element #15). ระดับมัธยมศึกษาปีที่ 1-3, เนื้อหาหลักสูตรการเรียนการสอนวิชาคณิตศาสตร์ 14 What elements have the largest atomic radius? Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Potassium. Answer: Would not phosphorus have the higher electronegativity…and why? The Rmax values for neutral gaseous element valence orbitals are abstracted from reference 1. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. White phosphorus is definitely the more exciting of the two. Further information is available in inorganic chemistry textbooks, usually at Level 1 or First Year University level. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. The chemical symbol for Niobium is Nb. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. The chemical symbol for Samarium is Sm. FOIA. Well, we define electronegativity as the ability of an atom involved in a chemical bond to polarize electron towards itself. Found inside – Page 92Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration ... Answer the following questions: (a) Atomic radius of hydrogen is 37 pm. Express it in metres. Our phosphorus page has over 260 facts that span 107 different quantities. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. The chemical symbol for Zirconium is Zr. al. It is occasionally found in native form as elemental crystals. The atomic radius i.e., the metallic radius of gallium (135 pm) is less than that of aluminium (143 pm). The chemical symbol for Titanium is Ti. Nickel is a silvery-white lustrous metal with a slight golden tinge. Density is defined as the mass per unit volume. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. The chemical symbol for Scandium is Sc. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. The chemical symbol for Nobelium is No. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Carbon is one of the few elements known since antiquity. Why is a phosphorus atom smaller than an aluminum atom when phosphorus's mass is larger than aluminum's? Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. As the positive charge of the atom increases the atomic radius decreases because the positive charge will bring electrons closer to the nucleus.. Atomic radius becomes smaller as you move across a row/period of the periodic table because . Found inside – Page 755Phosphorus has a larger atomic radius, cannot easily form strong P:P pi bonds, and thus forms only P:P single bonds in its elemental structures. Phosphorus exists as multiple allotropes, the three most common of which are white (P4 ... The chemical symbol for Gadolinium is Gd. Thulium is the thirteenth and third-last element in the lanthanide series. The radius of any anion is larger than the original neutral atom. 238 pm. According to the periodic table, which of the following indicates the correct decreasing order of ionization potential? Due to the quantum nature of electrons, the electrons are not point particles, they are smeared out over the whole atom. Chemically, indium is similar to gallium and thallium. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. The chemical symbol for Rhenium is Re. Found insideElementAtomic Radius (Å) Ionic Radius (Å) Ne 0.38 N/A P 0.98 1.00 Zn 1.42 1.35 14. The phosphorus ion is larger than a neutral phosphorus atom, yet a zinc ion is smaller than a neutral zinc atom. Which of the following statements best ... Lead is soft and malleable, and has a relatively low melting point. Found inside – Page 176The central atom E (where, E = N,P,As,Sb,Bi) in all the given hydrides is sp3 hybridized. ... So, present in phosphorus. ... The atomic size of nitrogen (atomic radius = 70 pm) is less than that of bismuth (atomic radius = 148 pm). Phosphorus (P) is most commonly a white-yellow solid non metal in Group 15 of the periodic table. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. The atomic radius of silicon is 110 pm, while the atomic radius of phosphorus is 100 pm. For definitions of ionic radius and further information, follow the hypertext link. Found inside – Page 359Summary of Periodic Trends Atomic lonization Electron Radius Energy Affinity Electronegativity Acidity so oo: o i o ... However, we expect the atomic radius of phosphorus to be smaller than that of magnesium, since atomic radii tend to ... The chemical symbol for Holmium is Ho. WebElements: THE periodic table on the WWW [www.webelements.com] วิชาชีววิทยาระดับมัธยมศึกษาปีที่ 4-6 Found insideChlorine and phosphorus would have the largest atomic radii as they both have three energy levels with electrons present. However, chlorine would be smaller than phosphorus because it has more protons (a higher effective nuclear charge) ... Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Francium is an alkali metal, that has one valence electron. creates bonds from overlap of atomic orbitals ( s, p, d …) and hybrid orbitals ( sp, sp2, sp3 …) combines atomic orbitals to form molecular orbitals ( σ σ, σ σ *, π π, π π *) forms σ or . Uses. What appears to be the trend in atomic radius as you move down a column? The bond length in PP is: 221pm. Assuming spherical shape, the uranium atom have volume of about  26.9 ×10−30 m3. Trends in atomic radius in Periods 2 and 3. Follow the appropriate hyperlinks for definitions of each radius type. It is the fourth most common element in the Earth’s crust. Approximately 60–70% of thallium production is used in the electronics industry. The atomic radius of Phosphorus atom is 107pm (covalent radius). The periodic trend. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. 3. 1,28 Å . Technetium is the lightest element whose isotopes are all radioactive; none are stable. Each entry has a full citation identifying its source. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Found inside – Page 722-2 Effective Atomic Radii in Molecules Now we turn our attention to the relationship between atomic properties and valence - orbital structures . First we will consider the effective radius of an atom in a molecule . Street light in many communities are sodium vapor lamps. The chemical symbol for Lead is Pb. Hafnium’s large neutron capture cross-section makes it a good material for neutron absorption in control rods in nuclear power plants, but at the same time requires that it be removed from the neutron-transparent corrosion-resistant zirconium alloys used in nuclear reactors. Phosphorus is used in the manufacture of safety matches (red phosphorus), pyrotechnics and incendiary shells. Found insideThe ionization energy and atomic radius of the phosphorus atom in Si can be specified in terms of the corresponding values of the H-atom with appropriate scaling of the. 8.6. The energy levels are generally given from Eq. (8.46) by One ... Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. It is the heaviest essential mineral nutrient. ระดับชั้นประถมศึกษาปีที่ 1-6 The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. Phosphorus is a chemical element in the periodic table that has the symbol P and atomic number 15. As an example, the internuclear distance between the two hydrogen atoms in an H 2 molecule is measured to be 74 pm. It is fairly obvious that the atoms get bigger as you go down groups. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Pure radium is silvery-white alkaline earth metal. Trends in atomic radius in Periods 2 and 3. Atomic radius of period 3 elements Na Mg Al Si P S Cl Ar Period 3 element 0.08 0.10 0.12 0.14 0.16 0.18 0.20 Atomic radius /nm. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. The chemical symbol for Iridium is Ir. The chemical symbol for Uranium is U. Typical densities of various substances are at atmospheric pressure. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. The chemical symbol for Lanthanum is La. Found inside – Page 233Atomic radii and electronegativities directly impact the overall structure of the ammonium and phosphonium cations. Phosphorus exhibits a larger atomic radius than nitrogen [24]. Electronegativity differences result in a different ... ระดับชั้นมัธยมศึกษาปีที่ 1-3 Found inside – Page 31steric factors have significantly lower effects on the reactivity, since the phosphorus atom has a considerably larger atomic radius (1.28 Å) than carbon (0.91 Å). As a result, the distances between phosphorus and its substituents are ... Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Atomic radius trends on periodic table. The Standard English unit is pounds mass per cubic foot (lbm/ft3). Found inside – Page 15Below is a lable of information for three disserent elements, Element Atomic Radius (A)|Ionic Radius (Å) Ne 0.38 N/A p 0.98 1.00 Zn 1.42 1.35 14. The phosphorusion is larger than aneutral phosphorus atom, yetazinc ionissmaller than ... Titanium can be used in surface condensers. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. Found inside – Page 82How does the atomic radius change as we go : closer to the nucleus and reduces the size of the atom. ... Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the 11⁄2 Q. 9. How does metallic character of ... This site offers comprehensive information for each element including: who, when & where; up to 40 properties (chemical & physical); over 3,600 nuclides (isotopes); over 4,400 nuclide decay modes; the element names in 10 different languages; and more. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Lawrencium is the final member of the actinide series. FOIA. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. The chemical symbol for Bromine is Br. This element exists in several forms, of which white and red are the best known. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. 15: Phosphorus - Phosphorous [P] Group: 15 Period: 3 Atomic number: 15 Atomic mass: 30.973762 Configuration: [Ne] 3s 2 3p 3 Atomic radius: 98 pm Covalent radius: 107 pm Electron affinity: 72 eV Ionization energy: 10.4867 eV Electronic term: 4 S 3/2 Mass fraction in the earth crust: 0.00099 Mass fraction in the earth space: 0.000007 . Chlorine is a yellow-green gas at room temperature. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Particle locations in quantum mechanics are not at an exact position, they are described by a probability density function. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Atomic Mass. The Cookies Statement is part of our Privacy Policy. The number of electrons in each of Phosphorus's shells is 2, 8, 5 and its electronic configuration is [Ne] 3s 2 3p 3.The phosphorus atom has a radius of 110.5.pm and its Van der Waals radius is 180.pm. Berkelium is a member of the actinide and transuranium element series. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on . The chemical symbol for Beryllium is Be. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Oxygen—atomic radius: 60 pm; covalent radius: 73 pm; ionic radius: 126 pm. Phosphorus is a chemical element with the symbol P and atomic number 15. The chemical symbol for Technetium is Tc. Question: 3. This means that the electron releasing tendency of ammonia is also more and is, therefore, a stronger base than phosphine. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. The chemical symbol for Antimony is Sb. Physics, 21.10.2020 18:01. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. The chemical symbol for Nickel is Ni. Found inside – Page 68Summary of Pe riodjc Trends Atomic Ionization Electron Radius Energy Affinity Electronegativity Acidity 6 I Example 46: Compared to ... Example 4-6: Which of the following will have a greater value for phosphorus than for magnesium? l. Found inside – Page 619AND PROPERTIES Example 26–25: Which of the following will have a greater value for phosphorus than for magnesium? I. Atomic radius II. Ionization energy III. Electronegativity A) I only B) I and II only C II and III only D) I, II, ... ระดับชั้นมัธยมศึกษาปีที่ 1-6 The atomic radius is the distance from the atomic nucleus to the outermost stable electron of a neutral atom. Titanium is a lustrous transition metal with a silver color, low density, and high strength. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Phosphorus contains fewer electrons than silicon, so the electron cloud is. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. The chemical symbol for Lithium is Li. It occurs on Earth as the decay product of various heavier elements. The chemical symbol for Sodium is Na. These lamps visually have an orange-yellow tint. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. The atomic radii decrease across the periodic table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. Found inside – Page 31Silicon is a covalently bonded gaint molecule , whereas phosphorus contains P , molecules loosely bonded together . Thus , for silicon the atomic volume is determined by the covalent radius , while for phosphorus it is the van der Waals ... เนื้อหาหลักสูตรวิชาคณิตศาสตร์ O-NET, เนื้อหาหลักสูตรการเรียนการสอนวิชาภาษาอังกฤษ Found inside – Page 154XB ) ATOMIC RADII OF PHOSPHORUS Various atomic or structural radii have been reported for phosphorus . The normal covalent radius and the tetrahedral covalent radius have the same value , 1.10 A. for a single bond , 123 obtained by ... Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. Phosphorus is a vital plant nutrient and its main use - via phosphate compounds - is in the production of fertilizers. the elements to the right of the Periodic Table as we face the Tab. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Lead is a heavy metal that is denser than most common materials. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. Contact. For each pair, circle which is larger, the. … It is due to the presence of additional 10 d-electrons in gallium which offer poor screening effect for the outer electrons from the increased nuclear charge. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on . Neon. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). The chemical symbol for Francium is Fr. Lead is widely used as a gamma shield. Atomic Radius of all the elements in the Periodic Table in Graph and Table format | Complete information about all the properties of elements using Graphs and Tables | Interactive Dynamic Periodic Table, Periodic Table Element Comparison, Element Property trends and complete information about the element - Facts, How to Locate on Periodic Table, History, Abundance, Physical Properties, Thermal . Found inside – Page 127Contrary to the metal sulfides, the structure of the metal phosphides is based on trigonal prisms having large phosphorus atoms (atomic radius of phosphorous is 0.109 nm) located in their centers. Importantly, contrary to the transition ... Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. © 2019 periodic-table.org / see alsowww.nuclear-power.net. (D) Electrons in the p subshell of oxygen atoms provide more shielding than those in nitrogen atoms. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. The chemical symbol for Iron is Fe. The chemical symbol for Plutonium is Pu. It is not always easy to make sensible comparisons between the elements however as some bonds are quite short because of multiple bonding (for instance the O=O distance in O2 is short because of the the double bond connecting the two atoms. Chemistry, 17.10.2021 02:10, bunbun2913 Compare radius of atom phosphorus with ionic radius phosphorus Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. N is more electronegative than P. From top to bottom down a group, electronegativity decreases. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Molecular Orbital Theory. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. It is one of the least reactive chemical elements and is solid under standard conditions. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Thorium is moderately hard, malleable, and has a high melting point. Tellurium is far more common in the universe as a whole than on Earth. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. - It has 13 protons and 13 electrons hence a net charge of "0" hence the atom is written simply as Al. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. The chemical symbol for Thulium is Tm. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. This is the currently selected item. Found inside – Page 1070Properties Nitrogen Phosphorus Arsenic Antimony Bismuth Symbol N P As Sb Bi Atomic number 7 15 33 51 83 Atomic weight ... 1 atm) -196 1.25g/L 280 1.83 Sublimes 5.73 1587 6.69 1560 9.81 Atomic radius, pm 70 110 120 140 150 Ion radius, ... First and second ionization energy. Atomic Radius of Phosphorus. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. And this is . Found inside – Page 103Chlorine and phosphorus would have the largest atomic radii as they both have three energy levels with electrons present. However, chlorine would be smaller than phosphorus because it has more protons (a higher effective nuclear charge) ... Phosphorous is a multivalent nonmetal of the nitrogen group, and it is found in nature in four or more allotropic forms (white or yellow, red or orange, black or violet phosphorus), where Ordinary phosphorus is a waxy white solid and the pure form of phosphorus is colorless or transparent. This is caused by the increase in the number of protons and electrons across a period. The atomic number is the amount of protons present in the atom. Follow the appropriate hyperlinks for literature references and definitions of each type of radius. The chemical symbol for Americium is Am. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. In general, for the main group elements of the periodic table: Atomic radius 1 increases down a Group, from top to bottom, of the Periodic Table . Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Atomic Radius . It is highly reactive, emits a faint glow upon uniting . Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material.