|Atomic mass||121.760 amu|
|Number of Stable Isotopes||2|
|Density (grams per cc)||6.68 g/cm^3|
|Date of discovery||Known since ancient times.|
|Name of discoverer||Unknown|
|Name origin||Greek anti and monos, "not alone".|
|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.