Cadmium (Cd)

Cadmium is a chemical element with symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury.

Atomic Number

48

Atomic Mass

112.41 u

Category

transition metal

Phase

solid

Density

8.65 g/cm³

Electron Shells

2, 8, 18, 18, 2

Atomic Structure

Protons: 48 • Electrons: 48 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰

Discovery

1817 • Karl Samuel Leberecht Hermann, Friedrich Stromeyer