Chromium

Transition Metal

Atomic Number: 24 • Atomic Mass: 51.9960 u • Period: 4 • Group: 6

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

Phase: Solid

Electronegativity: 1.66

History

Chromium has been known since ancient times

Discovered in Siberian red lead ore (crocoite, PbCrO₄)

Named for the many colorful compounds it forms

First isolated as a metal in 1798