Molybdenum Element (Periodic Table)

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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 yβ–β–100Ru

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