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