Name

Osmium

Atomic Number

76

Appearance

Silvery, blue shade

Phase At STP

Solid

Spectrum Image

Source

CAS Number

7440-04-02

CID Number

CID23937

DOT Number

3089

RTECS Number

RTECSRN1100000

Mendeleev Number

61

Pettifor Number

62

Space Group Number

194

Glawe Number

60

Atomic Mass

190.233 Da

Uncertainty

0.03

X Position

8

Y Position

6

Period

6

Group

8

Block

d

Category

Transition Metal

Geochemical

I am Metal

Goldschmidt

Siderophile

Electrical Type

Conductive

Sun

8e-7 mole ratio to silicon

Earth Crust

1.5e-9 g

Solar System

6.7e-7 mole ratio to silicon

Meteorites

0.000065 %

Jmol

Molcas Gv

CPK

Empirical

130

Calculated

185

Batsanov

200

Rahm

244

Uff

312

Mm3

235

Alvarez

248

Covalent (Single Bound)

128

Covalent (Triple Bound)

109

Covalent (Cordero)

144

Covalent (Pyykko)

129

Covalent (Pyykko Double)

116

Covalent (Pyykko Triple)

109

Mendeleev

126

C12

135

Metallic

135

Melting/Freeze (USE)

3306 °K

Melting/Freeze (WEL)

3306 °K

Melting/Freeze (CRC)

3306 °K

Melting/Freeze (LNG)

3318 °K

Boiling/Density (USE)

5285 °K

Boiling/Density (WEL)

5285 °K

Boiling/Density (CRC)

5285 °K

Boiling/Density (LNG)

5498 °K

Boiling/Density (Zhang)

5273 °K

Superconducting Point

0.66 °K

STP

22.59 kg/cm³

Solid (WEL)

22610 kg/cm³

Solid (CRC)

22590 kg/cm³

Solid (LNG)

22610 kg/cm³

Liquid (CR2)

20000 kg/cm³

Molar Volume

8.42 cm³/mol

Atomic Volume

8.43 cm³

Heat Of Fusion USE

31.7 kJ/mol

Heat Of Fusion CRC

57.85 kJ/mol

Heat Of Fusion LNG

57.85 kJ/mol

Heat Of Fusion WEL

31 kJ/mol

Evaporation USE

738 kJ/mol

Evaporation LNG

738 kJ/mol

Evaporation WEL

630 kJ/mol

Evaporation Zhang

678 kJ/mol

Molar Heat

24.7 J/molK

Heat Capacity USE

0.131 J/gK

Heat Capacity CRC

24.7 J/gK

Heat Capacity LNG

24.7 J/gK

Heat Capacity WEL

25 J/gK

Thermal Expansion

0.0000051 1/K

Adiabatic Index

N/A

Extensional

4940 m/s

Fluid

1451.4 m/s

273k

81.2 nΩm

Order

paramanyetic

Susceptibility

6e-10 m3/kg

Shear Modulus

222 GPa

Bulk Modulus

462 GPa

Poisson Ratio

0.25 ν

Mohs

7

Brinell

3920–4000

Observed/Predicted By

S. Tennant

Observed/Discovery Year

1803

Discovery Location

Isolated Sample Year

1803

Half Life

Stable

Lifetime

Stable

Neutron Mass Absorption

0.0023

Neutron Cross Section

15

Electron Affinity (eV)

1.1

Electron Affinity (kJ/mol)

103.99

Electron Affinity (pauling)

2.2

Electron Affinity (allen)

9.78

Electron Affinity (ghosh)

0.2479845

Accepted

57

Uncertainty

3

C6 GB

584

Constant Internal Default Radius

2.74

Strucutre

HEX

Angles

π/2, π/2, 2 π/3

Oxidation States

−4,−2,−1,0,1,2,3,4,5,6,7,8

Electron Configuration

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d6

Quantum Number

5D4

Electron Configuration Semantic

[Rook] 4f14 5d6 6s2

Shells-0

2

Shells-1

8

Shells-2

18

Shells-3

32

Shells-4

14

Shells-5

2

Ionization Energies-0

840

Ionization Energies-1

1600