Chromium Element (Periodic Table)

Chromium

Chromium (Cr) is a chemical element of the periodic table, located in the group 6 and the period 4, and has the atomic number 24. It is a hard, lustrous, silvery-grey transition metal, whose name comes from the Greek word “Chroma”, which means color. It is the 21th most abundant element on earth.

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 Chromium Element

Chromium
‣ What does chromium look like?

Appearance: silvery metallic
‣ Who discovered chromium and when?

Discovery and first isolation: Louis Nicolas Vauquelin (1794, 1797)
‣ Where is chromium found on the periodic table?

Chromium Periodic Table

Location: Chromium is found in the sixth column of the periodic table, next to the vanadium element.
‣ What is chromium’s atomic number?

Atomic number (Z): 24
‣ What is chromium’s symbol?

Symbol: Cr
‣ What is the atomic weight of chromium?

Standard atomic weight: 51.9961
‣ In which block of the periodic table is chromium (cr) found?

Block: d-block
‣ What group is chromium in on the periodic table?

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

Period: 4
Chromium atomic radius: empirical: 128 pm
Chromium covalent radius: 139±5 pm
‣ What is chromium’s melting point?

Melting point: 2180 K (1907 °C, 3465 °F)
‣ What is the boiling point of chromium?

Boiling point: 2944 K (2671 °C, 4840 °F)
‣ How many electron shells does chromium have?

Electrons per shell: 2, 8, 13, 1
‣ What is the correct electron configuration for chromium?

Electron configuration: [Ar] 3d5 4s1
‣ What is the ionization energy of chromium?

Ionization energies:
1st: 652.9 kJ/mol
2nd: 1590.6 kJ/mol
3rd: 2987 kJ/mol
‣ What is the phase of chromium?

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

Density (near r.t): 7.19 g/cm3
when liquid (at m.p): 6.3 g/cm3
Chromium magnetic ordering: antiferromagnetic (rather: SDW)
Chromium natural occurrence: primordial
‣ What is chromium oxidation state?

Oxidation state: -2, -1, 0, +1, +2, +3, +4, +5, +6
‣ What’s the electronegativity of chromium?

Electronegativity: Pauling scale: 1.66
Chromium poisson’s ratio: 0.21
Chromium heat of fusion: 21.0 kJ/mol
Chromium heat of vaporization: 347 kJ/mol
Chromium molar heat capacity: 23.35 J/(mol K)
Chromium molar magnetic susceptibility: +280.0 × 10-6 cm3/mol (273 K)
Speed of sound in chromium: 5940 m/s (at 20 °C)
‣ What is the crystal structure of chromium?

Crystal structure: body-centered cubic (bcc)
Thermal expansion of chromium: 4.9 µm/(m.K) (at 25 °C)
Thermal conductivity of chromium: 93.9 W/(m.K)
Chromium electrical resistivity: 125 nΩ.m (at 20 °C)
‣ What is the hardness of chromium?

Mohs hardness: 8.5
Vickers hardness: 1060 MPa
Brinell hardness: 687-6500 MPa
Young’s modulus of chromium: 279 GPa
Shear modulus of chromium: 115 GPa
Bulk modulus of chromium: 160 GPa
Chromium CAS number: 7440-47-3

‣ Chromium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)165618071991222325302942

‣ How many isotopes does chromium have?

Main isotopes of chromium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
50Cr4.345 %stable
51Crsyn27.7025 dε
γ
51V
52Cr83.789 %stable
53Cr9.501 %stable
54Cr2.365 %stable

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