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Chromium (Cr) – Element 24 of the periodic table

Chromium (symbol Cr) is element number 24 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 51.996, and its phase under standard conditions is Solid. This element sits in period 4 and group 6 of the periodic table, and its electrons are arranged in shells of 2, 8, 13, 1. The short electron configuration of Chromium is [Ar] 3d⁵ 4s¹. Known uses of Chromium include Stainless steel, Chrome plating and Pigments.

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Properties of Chromium

Atomic number
24
Chemical symbol
Cr
Atomic mass
51.996
Category
Transition metal
Period
4
Group
6
Phase
Solid
Protons
24
Electrons
24
Neutrons (approx.)
28
Electron shells
2, 8, 13, 1
Outer-shell electrons
1
Discovered
Louis Nicolas Vauquelin (1797)

Electron configuration of Chromium

The electron configuration of Chromium (Cr), with 24 electrons, is shown below. The last shell (shell 4) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
Short configuration
[Ar] 3d⁵ 4s¹
Last shell
4s¹

What is electron configuration and how is it written?

Electron shells of Chromium

Distribution of 24 electrons of Chromium across shells K to N:

  1. K2
  2. L8
  3. M13
  4. N1

What is a transition metal?

The transition metals are the d-block elements: usually good conductors of heat and electricity, with several oxidation states, and they form colourful compounds and important catalysts.

Uses of Chromium

Frequently asked questions about Chromium

What is the atomic number of Chromium?

The atomic number of Chromium (Cr) is 24; that is, every atom of it has 24 protons.

What is the electron configuration of Chromium?

The electron configuration of Chromium (Cr) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹; in short form it is [Ar] 3d⁵ 4s¹, and its last shell is 4s¹.

What is the chemical symbol of Chromium?

The chemical symbol of Chromium is Cr.

Where is Chromium located in the periodic table?

Chromium is located in period 4 and group 6 and belongs to the “Transition metal” category.

What is the atomic mass of Chromium?

The atomic mass of Chromium is about 51.996 (atomic mass units).

What is the phase of Chromium under normal conditions?

The phase of Chromium under standard conditions is Solid.

What are the uses of Chromium?

Uses of Chromium include Stainless steel, Chrome plating and Pigments.

Who discovered Chromium?

Chromium was discovered by Louis Nicolas Vauquelin in 1797.

Elements in the same category as Chromium (Transition metal)

Scandium (Sc)Titanium (Ti)Vanadium (V)Manganese (Mn)Iron (Fe)Cobalt (Co)Nickel (Ni)Copper (Cu)Zinc (Zn)Yttrium (Y)Zirconium (Zr)Niobium (Nb)Molybdenum (Mo)Technetium (Tc)Ruthenium (Ru)Rhodium (Rh)Palladium (Pd)Silver (Ag)Cadmium (Cd)Hafnium (Hf)

See all Transition metals

Chromium’s group 6 neighbours

Molybdenum (Mo)Tungsten (W)Seaborgium (Sg)

Group 6 of the periodic table