మూస:Infobox osmium

ఆస్మియం, ₀₀Os

ఆస్మియం
Pronunciation	/ˈɒzmiəm/ ​(OZ-mee-əm)
Appearance	silvery, blue cast
Standard atomic weight Ar°(Os)
	190.23±0.03 190.23±0.03 (abridged)
ఆస్మియం in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Ru ↑ Os ↓ Hs రీనియం ← ఆస్మియం → ఇరీడియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 6
Block	d-block
Electron configuration	[Xe] 4f14 5d6 6s2
Electrons per shell	2, 8, 18, 32, 14, 2
Physical properties
Phase at STP	solid
Melting point	3306 K ​(3033 °C, ​5491 °F)
Boiling point	5285 K ​(5012 °C, ​9054 °F)
Density (near r.t.)	22.59 g/cm3
when liquid (at m.p.)	20 g/cm3
Heat of fusion	57.85 kJ/mol
Heat of vaporization	738 kJ/mol
Molar heat capacity	24.7 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 3160 3423 3751 4148 4638 5256
Atomic properties
Oxidation states	−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8 (a mildly acidic oxide)
Electronegativity	Pauling scale: 2.2
Atomic radius	empirical: 135 pm
Covalent radius	144±4 pm
Spectral lines of ఆస్మియం
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	4940 m/s (at 20 °C)
Thermal expansion	5.1 µm/(m⋅K) (at 25 °C)
Thermal conductivity	87.6 W/(m⋅K)
Electrical resistivity	81.2 n Ω⋅m (at 0 °C)
Magnetic ordering	paramagnetic
Shear modulus	222 GPa
Bulk modulus	462 GPa
Poisson ratio	0.25
Mohs hardness	7.0
Brinell hardness	3920 MPa
CAS Number	7440-04-2
History
Discovery	Smithson Tennant (1803)
First isolation	Smithson Tennant (1803)
Isotopes of ఆస్మియం

References

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