Chromium (Cr)

Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard and brittle transition metal.

Atomic Number

24

Atomic Mass

51.996 u

Category

transition metal

Phase

solid

Density

7.15 g/cm³

Electron Shells

2, 8, 13, 1

Atomic Structure

Protons: 24 • Electrons: 24 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵

Discovery

1797 • Louis Nicolas Vauquelin