51 Sb 121.7601

Antimony

METALLOID

Phase: Solid

Discovered: unknown, before 3000 BC

Block: P

Summary

Antimony is a chemical element with symbol Sb (from Latin:stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were used for cosmetics; metallic antimony was also known, but it was erroneously identified as lead upon its discovery.

Appearance: silvery lustrous gray

Source: Wikipedia

Physical Properties

Atomic Mass 121.7601 u

Density 6.697 g/cm³

Melting Point 903.78 K

Boiling Point 1908 K

Molar Heat 25.23 J/(mol·K)

Electron Affinity 101.059 kJ/mol

Ionization Energies

1^st: 834 kJ/mol

2^nd: 1594.9 kJ/mol

3^rd: 2440 kJ/mol

4^th: 4260 kJ/mol

5^th: 5400 kJ/mol

6^th: 10400 kJ/mol