Osmium (76 Os) has seven naturally occurring isotopes, six of which are stable: 184 Os, 187 Os, 188 Os, 189 Os, 190 Os, and (most abundant) 192 Os. Video Are you having trouble understanding the basics of atomic elements? The other natural isotope, 186 Os, has an extremely long half-life (2×10 15 years) and for practical purposes can be considered to be stable as well. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a … The chemical symbol for Osmium is Os. It has the lowest vapor pressure and the highest melting point of the platinum group. Mol Heat Of Fusion 31. Osmium has an atomic mass of 190.23 u. Atomic number. Osmium metal is a bluish white, lustrous, extremely hard, and brittle even at high temperatures. Check my Elements Comprehensive List. Osmium has the atomic number 76 and an atomic mass of 190.23 u. The electron configuration of osmium is [Xe] 4f145d66s2. The mass of an atom is determined by how many heavy particles (protons and neutrons) are in the nucleus. Osmium is non-toxic in its crystalline form as long as a temperature of 400 °C is not exceeded. Osmium has a bluish-silvery lustre. Atomic Mass 190,23 Learn more about the atomic mass. Atomic mass. At this time, osmium had the largest uncertainty among all standard atomic weights, equalled with lead (for which, however, the atomic weight is affected by natural variability, not applicable to osmium). Osmium Element: Osmium Element in Periodic Table | Atomic Number Atomic Mass The mean radius of osmium is 130 pm, its atomic radius or Bohr radius is 185 pm, and its covalent radius is 128 pm. The radioactive isotope of osmium is osmium-186 and has a very long half-life (2 × 10 15 years). ››More information on molar mass and molecular weight. Its electron configuration is [Xe] 4f14 5d6 6s2. Electrons are lighter by a factor of almost 2000 so don’t really matter. State at 20 °C Solid Discovery Discovered By: Smithson Tenant Year: 1804 Location: England Want to learn more details and data about Osmium (Os)? Name Origin Greek: osmê (odor). There are six stable isotopes of osmium, osmium-184, osmium-187, osmium-188, osmium-189, osmium-190 and osmium-192. Mol You May Find Additional Useful Data In The ALEKS Data Tab. It is very densest metal, even little more than iridium (22.56 g/cm 3).. REFERENCES [1]. Osmium is a lustrous & silvery metal taking a spot in the periodic table with an atomic number of 76. Does The Following Reaction Absorb Or Relcasc Cnergy? The chemical element Osmium is classed as hard, brittle, bluish-white transition metal.Its atomic number is 76 and represented by the symbol Os. Osmium has seven naturally occurring isotopes. Isotopes of Osmium. Learn the uses of osmium, density of osmium & many more. Question: Consider The Following Data For Osmium: Atomic Mass 190.23 2 Mol Electronegativity 2.20 Electron Affinity 106.1 Mol KJ Ionization Energy 840. Density is determined by mass over volume. Electronegativity according to Pauling 76. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. In 1969, the Commission recommended A r (Os) = 190.2(l). chemical properties, health and environmental effects of osmium. The electronic configuration of the elements determines the way in which the electrons are structured in the atoms of an element. 190.2 g.mol-1. The most abundant stable isotope is osmium-192. 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