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Osmium Element Properties, Transition metals Group, Periodic Table of the Elements

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Osmium

Osmium Element Properties

d75
Re
Rhenium
d76
Os
Osmium
d77
Ir
Iridium
General
NameOsmium
SymbolOs
Number76
Group Number8
GroupTransition metals
Blockd
Density22.40 g/cm3
Atomic Weight190.2 g/mol
Atomic Volume8.49 cm3/mol
Discover1804


States
StateSolid
Melting Point3306 K
Boiling Point5285 K
Triple PointNil
Critical PointNil
Heat of Fusion57.85 kJ/mol
Heat of Vaporization738 kJ/mol


Energies
First Ionization Energy840 kJ/mole
Second Ionization EnergyNil
Third Ionization EnergyNil
Electronegativity2.2
Electron Affinity110 kJ/mole
Specific Heat0.13 J/gK
Heat Atomization791 kJ/mole atoms


Oxidation and Electrons
Shells2,8,18,32,14,2
Electron Configuration[Xe] 4f14 5d6 6s2
Minimum Oxidation Number-2
Maximum Oxidation Number8
Minimum Common Oxidation Number0
Maximum Common Oxidation Number4


Appearance and Characteristics
Crystal Structurehexagonal
Characteristicshard, dense, inert <100 C
Colorbluish-white
Useshard alloys,phono needles
Hardness7 mohs
ToxicityNone


Reactions
Reaction with AirNone
Reaction with 6M HClNone
Reaction with 15M HNO3mild, =>OsO4
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes7
HydrideNone
OxideOsO2 OsO4
ChlorideOsCl3 OsCl4 OsCl5


Radius
Atomic Radius135 pm
Ionic Radius (1+ ion)Nil
Ionic Radius (1- ion)Nil
Ionic Radius (2+ ion)Nil
Ionic Radius (2- ion)Nil
Ionic Radius (3+ ion)Nil


Conductivity
Thermal Conductivity87.6 J/m-sec-deg
Electrical Conductivity105.263 1/mohm-cm
Polarizability8.5 A3


Abundance
Sourcenickel ores (sulfides)
Relation Abundance Solar System-0.171 log
Abundance Earth's Crust-2.8 log


d75
Re
Rhenium
d76
Os
Osmium
d77
Ir
Iridium




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