Name Antimony
Symbol Sb
Atomic Number 51
Atomic Mass 121.76 atomic mass units
Number of Protons 51
Number of Neutrons 71
Number of Electrons 51
Melting Point 630.0 C
Boiling Point 1750.0 C
Density 6.684 grams per cubic centimeter
Normal Phase Solid
Family Metalloids
Period 5
Cost $4.50 per 100 grams



Origin of Name From the Greek words anti, meaning opposed and
monos, meaning solitude or not alone
Date and Place of Discovery Known to the ancients
Discovered by Unknown
Common Compounds
Interesting facts
  • Nicolas Lemery described it first in 1707.
  • It rarely occurs free in nature.
  • It is often found in other ores such as silver, copper, and lead.
  • Its ores are widely distributed.
  • It does not react with air or water and does not react with fluorine, chlorine or bromine.
  • At high temperatures, it will ignite and burn in air.
  • It and its compounds are toxic; however, potassium antimonyl tartrate is used in medicine.
  • In some countries it was used as eye makeup for centuries.
Common Uses
  • Flame proofing
  • Paints
  • Ceramics
  • Enamels
  • Electronics
  • Rubber products
  • Semiconductors
  • Infrared detectors
  • Batteries
  • Small arms
  • Tracer ammunition
  • Cable sheathing
  • Matches
  • Medicines such as antiprotozoal drugs
  • Plumbing
  • Soldering
  • Internal combustion engines


Photo Courtesy of
Chemical Elements
Environmental Chemistry
Web Elements

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