Mo - Molybdenum

This transition metal was discovered by Scheele in 1778 and extracted in metallic form in 1783 by P. H. Hjelm in Sweden.

Atomic number - 42 Density g/mL 10 .2

Atomic weight u 95 .94 Melting point K 2890

Bonding radius A 1 .3 Boiling point K 4912

Atomic radius A 2 .01 Heat of vaporization kJ/mol 598

Ionization Potential V 7 .099 Heat of fusion kJ/mol 32

Electronegativity - 2 .16 Specific heat J/gK 0 .25

The oxide is a strong acid.
Crystal are body centered cubic.

Electron config. : [Kr] 4d⁵ 5s¹

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Mo: Click mass number for decay process, product for element page.

086
19.6 sec
EC,4.800 MeV
Nb-86
85.930219 087
14.5 sec
EC/ECp,6.490
Nb-87/Zr-86
86.927331 088
8.0 min
EC,3.720 MeV
Nb-88
87.921952 089
2.04 min
EC,5.580 MeV
Nb-89
88.919479 090
5.56 hr
EC,2.489 MeV
Nb-90
89.913936 091
15.49 min
EC,4.434 MeV
Nb-91
90.911749 092 14.84%

Stable

91.906809

093
4.0E+3 yr
EC,2.893 MeV
Nb-93
92.906812 094 9.25%

Stable

93.905086 095 15.92%

Stable

94.905841 096 16.68%

Stable

95.904678 097 9.55%

Stable

96.906020 098 24.13%

Stable

97.905406 099
65.94 hr
B-,1.357 MeV
Tc-99
98.907710

100 9.63%
1.2E19 yr
2B-,3.034 MeV
Ru-100
99.907476 101
14.61 min
B-,2.824 MeV
Tc-101
100.91034 102
11.3 min
B-,1.010 MeV
Tc-102
101.91029 103
67.5 sec
B-,3.750 MeV
Tc-103
102.91320 104
60 sec
B-,2.160 MeV
Tc-104
103.91376 105
35.6 sec
B-,4.950 MeV
Tc-105
104.91697 106
8.4 sec
B-,3.520 MeV
Tc-106
105.91813

107
3.5 sec
B-,6.160 MeV
Tc-107
106.92169 108
1.09 sec
B-,4.640 MeV
Tc-108
107.92345 109
0.53 sec
B-,7.500 MeV
Tc-109
108.92764 110
0.30 sec
B-,5.700 MeV
Tc-110
109.92946 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	42		Density	g/mL	10	.2
Atomic weight	u	95	.94	Melting point	K	2890
Bonding radius	A	1	.3	Boiling point	K	4912
Atomic radius	A	2	.01	Heat of vaporization	kJ/mol	598
Ionization Potential	V	7	.099	Heat of fusion	kJ/mol	32
Electronegativity	-	2	.16	Specific heat	J/gK	0	.25
The oxide is a strong acid.				Crystal are body centered cubic.
Electron config. : [Kr] 4d⁵ 5s¹
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086 19.6 sec EC,4.800 MeV Nb-86 85.930219	087 14.5 sec EC/ECp,6.490 Nb-87/Zr-86 86.927331	088 8.0 min EC,3.720 MeV Nb-88 87.921952	089 2.04 min EC,5.580 MeV Nb-89 88.919479	090 5.56 hr EC,2.489 MeV Nb-90 89.913936	091 15.49 min EC,4.434 MeV Nb-91 90.911749	092 14.84% Stable 91.906809
093 4.0E+3 yr EC,2.893 MeV Nb-93 92.906812	094 9.25% Stable 93.905086	095 15.92% Stable 94.905841	096 16.68% Stable 95.904678	097 9.55% Stable 96.906020	098 24.13% Stable 97.905406	099 65.94 hr B-,1.357 MeV Tc-99 98.907710
100 9.63% 1.2E19 yr 2B-,3.034 MeV Ru-100 99.907476	101 14.61 min B-,2.824 MeV Tc-101 100.91034	102 11.3 min B-,1.010 MeV Tc-102 101.91029	103 67.5 sec B-,3.750 MeV Tc-103 102.91320	104 60 sec B-,2.160 MeV Tc-104 103.91376	105 35.6 sec B-,4.950 MeV Tc-105 104.91697	106 8.4 sec B-,3.520 MeV Tc-106 105.91813
107 3.5 sec B-,6.160 MeV Tc-107 106.92169	108 1.09 sec B-,4.640 MeV Tc-108 107.92345	109 0.53 sec B-,7.500 MeV Tc-109 108.92764	110 0.30 sec B-,5.700 MeV Tc-110 109.92946	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass