Antimony is a metallic element with an atomic mass of 121,760 u. It melts at 903.78 K and boils at 1860 K, with a density of 6.697 g/cm3. Antimony was discovered as early as 3000 BC and its largest applications are as an alloying material for lead and tin in lead-acid batteries, solders, bullets, and plain bearings due to improved properties. Antimony compounds are also used as fire retardants in many commercial and domestic products.

1. 51
Antimonio –Antimony
Mass: 121,760 u
[Kr] 4d10
5s2
5p3
Melting point: 903,78 K
Boiling point: 1860 K
Density: 6,697 g·cm-3
Discovery: Anonim , 3000BC
The largest applications for metallic antimony are as alloying
material for lead and tin and for lead antimony plates in lead-acid
batteries. Alloying lead and tin with antimony improves the properties of
the alloys which are used in solders, bullets and plain bearings. Antimony
compounds are prominent additives for chlorine- and bromine-containing
fire retardants found in many commercial and domestic products. An
emerging application is the use of antimony in microelectronics.