Antimony (Sb)

Symbol Sb
Appearance Silvery Lustrous Gray
Atomic Number 51
Atomic Weight 121.7 g/mol
Group 15
Period 5
Block p-block
Phase at STP solid
Melting Point 903.78 K
Boiling Point 1908 K
Density 6.69 g/cm3

Antimony is 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 powdered for use as medicine and cosmetics, often known by the Arabic name kohl.

The largest applications for metallic antimony are an alloy with lead and tin and the lead antimony plates in lead–acid batteries. Alloys of lead and tin with antimony have improved properties for 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.