Molybdenum 42

Atomic No. Order:

Alphabetic Order:

Periodic Table

Cr
24

Mo
42

W
74

Sg
106

Uph
156

Bnh
206

Molybdenum

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

95.96 ± 0.02 [IUPAC 2007]

Atomic Radius pm

136

First Ionisation Energy
kJ mol ^-1

685.0

Ionisation Energy (eV)

7.9240

Electronegativity

2.16

Density
kg m ^-3

10220 [293 K]
9330 [l., m.p.]

Molar Volume cm ³

9.39

Thermal Conductivity
W m ^-1 K ^-1

138 [300 K]

Melting Point K

2890

Boiling Point K

4885

Number of Isotopes

Isotope Atomic mass/u Mole fraction

92Mo 91.906 810(4) 0.1477(31)
94Mo 93.905 0867(20) 0.0923(10)
95Mo 94.905 8406(20) 0.1590(9)
96Mo 95.904 6780(20) 0.1668(1)
97Mo 96.906 0201(20) 0.0956(5)
98Mo 97.905 4069(20) 0.2419(26)
100Mo 99.907 476(6) 0.0967(20)

Inner + outer Shells

Inner + outer Orbitals

Rule

Algorythm of Software

2, 8, 18,

13, 1

2, 8, 18,

12, 2

Filling Orbital

4d ⁵

4d ⁴

Ground State Electron Configuration

[Kr]

4d ⁵

5s ¹

[Kr]

4d ⁴

5s ²

Ground State Electron Configuration with free Orbitals (n=12)

0, 0, 0, 5, 7

0, 0, 0, 6, 6

Ground State Electron Configuration with compressed Orbitals (n=56)

0, 0, 0, 14, 42

Singularity

110

	s	p	d		f	g	h	i	j
1	2
2	2	6
3	2	6	10
4	2	6	4	6	14
5	2	6	10		14	18
6
7
8

Term Symbol

⁷S ₃

Discovery

Molybdenum was discovered by the Swedish pharmacist and chemist Carl Wilhelm Scheele in 1778. It was first isolated by the Swedish chemist Peter-Jacob Hjelm (Uppsala, Sweden) in 1781.

Name Derived From

The name derives from the Greek molybdos for "lead". The ancients used the term lead for any black mineral that leaves a mark on paper.

APSIDIUM ©	Created:		2002-06-01		042.pdf
	Page update:		2007-12-09		042.pdf