Name

Molybdenum

Atomic Number

42

Appearance

Metallic gray

Phase At STP

Solid

Spectrum Image

Source

CAS Number

7439-98-7

CID Number

CID23932

DOT Number

3089

RTECS Number

RTECSQA4680000

Mendeleev Number

52

Pettifor Number

55

Space Group Number

229

Glawe Number

56

Atomic Mass

95.951 Da

Uncertainty

0.01

X Position

6

Y Position

5

Period

5

Group

6

Block

d

Category

Transition Metal

Goldschmidt

Siderophile

Electrical Type

Conductive

Urban Soil

0.0024 mg/kg

Seawater

1e-8 kg/L

Sun

0.0000023 mole ratio to silicon

Earth Crust

0.0000012 g

Solar System

0.0000026 mole ratio to silicon

Meteorites

0.00012 %

Jmol

Molcas Gv

CPK

Empirical

145

Calculated

190

Batsanov

210

Rahm

244

Uff

305.2

Mm3

239

Alvarez

245

Covalent (Single Bound)

145

Covalent (Triple Bound)

113

Covalent (Cordero)

154

Covalent (Pyykko)

138

Covalent (Pyykko Double)

121

Covalent (Pyykko Triple)

113

Mendeleev

130

C12

139

Metallic

139

Melting/Freeze (USE)

2896 °K

Melting/Freeze (WEL)

2896 °K

Melting/Freeze (CRC)

2896 °K

Melting/Freeze (LNG)

2895 °K

Boiling/Density (USE)

4912 °K

Boiling/Density (WEL)

4912 °K

Boiling/Density (CRC)

4912 °K

Boiling/Density (LNG)

5098 °K

Boiling/Density (Zhang)

4885 °K

Superconducting Point

0.92 °K

STP

10.28 kg/cm³

Solid (WEL)

10280 kg/cm³

Solid (CRC)

10200 kg/cm³

Solid (LNG)

10280 kg/cm³

Liquid (CR2)

9330 kg/cm³

Molar Volume

9.38 cm³/mol

Atomic Volume

9.4 cm³

Heat Of Fusion USE

28 kJ/mol

Heat Of Fusion CRC

37.48 kJ/mol

Heat Of Fusion LNG

37.48 kJ/mol

Heat Of Fusion WEL

36 kJ/mol

Evaporation USE

590 kJ/mol

Evaporation LNG

617 kJ/mol

Evaporation WEL

600 kJ/mol

Evaporation Zhang

617 kJ/mol

Molar Heat

24.06 J/molK

Heat Capacity USE

0.251 J/gK

Heat Capacity CRC

24.06 J/gK

Heat Capacity LNG

24.13 J/gK

Heat Capacity WEL

24.1 J/gK

Thermal Expansion

0.0000048 1/K

Adiabatic Index

N/A

Longitudinal

6250 m/s

Transversal

3350 m/s

Extensional

5400 m/s

80k

4.82 nΩm

273k

48.5 nΩm

293k

53.4 nΩm

298k

54.7 nΩm

300k

55.2 nΩm

500k

106 nΩm

Order

paramanyetic

Susceptibility

1.2e-8 m3/kg

Shear Modulus

120 GPa

Bulk Modulus

230 GPa

Poisson Ratio

0.31 ν

Youngs Modulus

329 GPa

Mohs

5.5

Brinell

1370–2500

Vickers

1400–2740

Observed/Predicted By

W. Scheele

Observed/Discovery Year

1778

Discovery Location

Isolated Sample By

J. Helmet

Isolated Sample Year

1781

Half Life

Stable

Lifetime

Stable

Neutron Mass Absorption

0.0009

Neutron Cross Section

2.6

Electron Affinity (eV)

0.748

Electron Affinity (kJ/mol)

72.1

Electron Affinity (pauling)

2.16

Electron Affinity (allen)

8.71

Electron Affinity (ghosh)

0.1312672

Accepted

87

Uncertainty

6

C6 GB

1030

Constant Internal Default Radius

3.15

Constant

314.7, 314.7, 314.7

Strucutre

BCC

Angles

p/2, p/2, p/2

Oxidation States

−4,−2,−1,0,1,2,3,4,5,6

Electron Configuration

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d5

Quantum Number

Disappointed

Electron Configuration Semantic

[Kr] 4d5 5s1

Shells-0

2

Shells-1

8

Shells-2

18

Shells-3

13

Shells-4

1

Ionization Energies-0

684.3

Ionization Energies-1

1560

Ionization Energies-2

2618

Ionization Energies-3

4480

Ionization Energies-4

5257

Ionization Energies-5

6640.8

Ionization Energies-6

12125

Ionization Energies-7

13860

Ionization Energies-8

15835

Ionization Energies-9

17980

Ionization Energies-10

20190

Ionization Energies-11

22219

Ionization Energies-12

26930

Ionization Energies-13

29196

Ionization Energies-14

52490

Ionization Energies-15

55000

Ionization Energies-16

61400

Ionization Energies-17

67700

Ionization Energies-18

74000

Ionization Energies-19

80400

Ionization Energies-20

87000

Ionization Energies-21

93400

Ionization Energies-22

98420

Ionization Energies-23

104400

Ionization Energies-24

121900

Ionization Energies-25

127700

Ionization Energies-26

133800

Ionization Energies-27

139800

Ionization Energies-28

148100

Ionization Energies-29

154500