Molybdenum Element (Periodic Table)

Molybdenum

Molybdenum (Mo) is a chemical element of the periodic table, located in the group 6 and the period 5, and has the atomic number 42. It is a hard, silvery-white transition metal, whose name comes from the Greek word “molybdos”, which means lead.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6
55
Cs
56
Ba
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7
87
Fr
88
Ra
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
– d block

FAQs on Molybdenum Element

Molybdenum
‣ What does molybdenum look like?

Appearance: grey metallic
‣ Who discovered molybdenum? When was molybdenum discovered?

Discovery: Carl Wilhelm Scheele (1778)
First isolation: Peter Jacob Hjelm (1781)
‣ Where is molybdenum found on the periodic table?

Molybdenum Periodic Table

Location: Molybdenum is found in the sixth column of the periodic table, next to the niobium element.
‣ What is the atomic number of molybdenum?

Atomic number (Z): 42
‣ What is the symbol of molybdenum?

Symbol: Mo
‣ What is the atomic weight of molybdenum?

Standard atomic weight: 95.95
‣ What block does molybdenum belong to?

Block: d-block
‣ What group does molybdenum belong to?

Group: 6
‣ What period is molybdenum in on the periodic table?

Period: 5
‣ What is the atomic radius of molybdenum?

Atomic radius: empirical: 139 pm
Molybdenum covalent radius: 154±5 pm
‣ What is the melting point of molybdenum?

Melting point: 2896 K (2623 °C, 4753 °F)
‣ What is molybdenum boiling point?

Boiling point: 4912 K (4693 °C, 8382 °F)
‣ How many electron shells does molybdenum have?

Electrons per shell: 2, 8, 18, 13, 1
‣ Which is the correct electron configuration for the element molybdenum (mo)?

Electron configuration: [Kr] 4d5 5s1
Molybdenum ionization energies:
1st: 684.3 kJ/mol
2nd: 1560 kJ/mol
3rd: 2618 kJ/mol
‣ What phase is molybdenum normally found in?

Phase (at r.t): solid
‣ What is the density of molybdenum?

Density (near r.t): 10.28 g/cm3
when liquid (at m.p): 9.33 g/cm3
Molybdenum magnetic ordering: paramagnetic
Molybdenum natural occurrence: primordial
‣ What is molybdenum oxidation state?

Oxidation state: +2, +3, +4, +5, +6
‣ What’s the electronegativity of molybdenum?

Electronegativity: Pauling scale: 2.16
Molybdenum poisson’s ratio: 0.31
Molybdenum heat of fusion: 37.48 kJ/mol
Molybdenum heat of vaporization: 598 kJ/mol
Molybdenum molar heat capacity: 24.06 J/(mol K)
Molybdenum molar magnetic susceptibility: +89.0 × 10-6 cm3/mol (298 K)
Speed of sound in molybdenum: 5400 m/s (at r.t)
‣ What is the crystal structure of molybdenum?

Crystal structure: body-centered cubic (bcc)
Thermal expansion of molybdenum: 4.8 µm/(m.K) (at 25 °C)
Thermal conductivity of molybdenum: 138 W/(m.K)
Molybdenum thermal diffusivity: 54.3 mm2/s (at 300 K)
Molybdenum electrical resistivity: 53.4 nΩ.m (at 20 °C)
‣ Molybdenum hardness

Mohs hardness: 5.5
Vickers hardness: 1400-2740 MPa
Brinell hardness: 1370-2500 MPa
Young’s modulus of molybdenum: 329 GPa
Shear modulus of molybdenum: 126 GPa
Bulk modulus of molybdenum: 230 GPa
Molybdenum CAS number: 7439-98-7

‣ Molybdenum vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)274229943312370742124879

‣ How many isotopes does molybdenum have?

Main isotopes of molybdenum
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
92Mo14.65 %stable
93Mosyn4 × 103 yε93Nb
94Mo9.19 %stable
95Mo15.87 %stable
96Mo16.67 %stable
97Mo9.58 %stable
98Mo24.29 %stable
99Mosyn65.94 hβ
γ
99Tc
100Mo9.74 %7.8 × 1018 yββ100Ru

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