Sb

Antimony

Atomic Number 51 · Metal chunk

A lustrous metalloid used since ancient times as eye makeup (kohl). Now used in flame retardants and lead-acid batteries.

Atomic Mass

121.76 u

Category

Metalloid

Phase (STP)

Solid

Density

6.685 g/cm³

Melting Point

630.63 °C

Boiling Point

1587 °C

Electronegativity

2.05 (Pauling)

Atomic Radius

145 pm

Electron Configuration

[Kr] 4d10 5s2 5p3

Discovered

Ancient — Known since antiquity

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Sample form: Metal chunk

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