Elements
24

Cr

Chromium

Chromium (Cr) is a silver metal that has the atomic number 24 in the periodic table. It is a Transition metal and located in Group 6 of the periodic table. It has the symbol Cr.

Chromium was discovered in 1780 by the French chemist Nicolas Louis Vauquelin. It was through his work with the mineral Crocoite that he discovered when it was heated with Potassium carbonate it produced a yellow salt. In 1781 he managed to isolate the metal by heating the oxide sample with charcoal. Chromium draws its name from the Greek ‘Chroma’ meaning colour due to its ability to form multiple coloured compounds. Chromium is used extensively in the production of stainless steel and other alloys due to its high shine finish and its ability to resist corrosion. It does this as a small layer of Chromium oxide forms on the surface preventing further reaction to oxygen. Its salts are used as a variety of pigments due to the wide range of colours formed. It is located in Group 6 and it has a melting point of 1907°c and a boiling point of 2671°c being a solid metal at room temperature.

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FAQ's

What is the Melting Point for Chromium?

Chromium has a Melting Point of 1890°F, meaning at 1890°F it will turn to a liquid.

What is the Boiling Point for Chromium?

Chromium has a Boiling Point of 2482°F, meaning at 2482°F it will turn to a Gas.

What is the Electronegativity of Chromium?

Chromium's Electronegativty is 1.66. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Chromium?

Chromium has a Heat of Vaporization of 344.3 kJ/mol.

Uses

Used to make stainless steel. It gives the color to rubies and emeralds. Iron-nickel-chromium alloys in various percentages yield an incredible variety of the most important metals in modern technology.

Sources

Chromite [Fe,Mg(CrO4)] is its most important mineral. Produced commercially by heating its ore in the presence of silicon or aluminium.

24
Protons
24
Electrons
28
Neutrons

Cr

Element Symbol
Cr
Atomic Weight
51.996
Atomic Number
24
State
Solid
Melting Point
Unknown
1890
°C
Boiling Point
2482
Unknown
°C
Heat of Vaporization
344.3
Unknown
kJ/mol
Crystal Structure
Cubic: Body centered
Thermoconductivity
0.937
Unknown
W/cmK
Shells
2,8,13,1
Group
Transition Metal
Period
4
Block
D Block
Orbitals
[Ar] 3d5 4s1
Coefficient of Thermal Expansion
4.9 10^-6 K^-1
Covalent Radius
1.18 Å
Density at 293K
7.19 g/cm³
Electrical Conductivity
0.0774 10^6/cm ohm
First Ionization Potential
6.7666 V
Second Ionization Potential
16.50 V
Third Ionization Potential
30.96 V
Ionic Radius
.62 (+3) Å
Oxydation States
6,(3),2
Lattice Parameter
2.8847 Å
Lattice Parameter 2
--
Lattice Parameter 3
4.070 Å
Pronounced

KROH-mi-em

Discovered by

Louis Vauquelin

Discovery date

1797

Orbital configuration
2,8,13,1

Download the Periodic Table

Explore Other Transition Metals

92.906
41

Nb

Niobium
58.933
27

Co

Cobalt
44.956
21

Sc

Scandium
54.938
25

Mn

Manganese
95.95
42

Mo

Molybdenum
55.845
26

Fe

Iron
106.42
46

Pd

Palladium
102.905
45

Rh

Rhodium
200.592
80

Hg

Mercury
97
43

Tc

Technetium
270
105

Db

Dubnium
63.546
29

Cu

Copper
195.084
78

Pt

Platinum
270
107

Bh

Bohrium
88.906
39

Y

Yttrium
112.414
48

Cd

Cadmium
192.217
77

Ir

Iridium
91.224
40

Zr

Zirconium
196.967
79

Au

Gold
183.84
74

W

Tungsten
269
106

Sg

Seaborgium
190.23
76

Os

Osmium
101.07
44

Ru

Ruthenium
285
112

Cn

Copernicium
180.948
73

Ta

Tantalum
47.867
22

Ti

Titanium
186.207
75

Re

Rhenium
267
104

Rf

Rutherfordium
270
108

Hs

Hassium
107.868
47

Ag

Silver
50.942
23

V

Vanadium
178.49
72

Hf

Hafnium
65.38
30

Zn

Zinc
58.693
28

Ni

Nickel
Transition metal is any of various chemical elements that have valence electrons (electrons that can participate in the formation of chemical bond) in two shells instead of only one. They form group 3 (IIIb) through group 12 (IIb).
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