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Name Antimony
Symbol Sb
Atomic number 51
Atomic mass 121.760 amu
Classification Pnictogen
Crystal structure Rhombohedral
Density 6.68 g/cm^3
Color Bluish white or grey
Number of Stable Isotopes 2
Date of discovery Known since ancient times.
Name of discoverer Unknown
Name origin Greek anti and monos, "not alone".
Uses Various.
Obtained from Stibnite, ullmanite, and valentinite.

Antimony (Sb) is a toxic, flaky, brittle element with the symbol Sb (Latin: stibium, meaning "mark") and atomic number 51. It does not react with air, but burns brightly when ignited. Since it is not a metal, antimony is a poor conductor of both heat and electricity. The stable form of antimony is a blue-white metalloid. Yellow and black antimony are unstable non-metals. Antimony is used in flame-proofing, paints, batteries, ceramics, enamels, as a hardener for lead and other metals, and in a wide variety of alloys, electronics, and rubber. The ancient Egyptians used black stibnite as eye make-up.

Antimony is a member of the "pnictogen" (group 15) of the periodic table. This is the area that has a metal near the bottom (bismuth) and some nonmetals near the top (nitrogen). Antimony in between—It is one of the few elements which is neither a metal or a non-metal.

Antimony was known as an element at least as far back as the alchemists. It was first scientifically studied in 1707 by Nicolas Lemery.