Antimony (Sb Element)

Symbol Sb
Atomic Number 51
Atomic Mass 121.760 g.mol -1
Discovery approx 1600 BC

Chemical Properties of Antimony

Group 15 Melting point 630.628°C, 1167.13°F, 903.778 K
Period 5 Boiling point 1587°C, 2889°F, 1860 K
Block p Density (g cm−3) 6.68
Atomic number 51 Relative atomic mass 121Sb
State at 20°C Solid Key isotopes 7Sb
Electron configuration [Kr]4d15s5p3 CAS number 7440-36-0
ChemSpider ID 4510681 ChemSpider is a free chemical structure database.

What is Antimony?

  • Antimony is a semi-metallic chemical element with an atomic number 51 and symbol Sb in the Periodic Table.
  • The Latin name of Antimony is Stibium. It is generally found in two forms namely metallic form and non-metallic form.
  • Antimony compounds are used since ancient times as a component in cosmetics.
  • It is naturally found in Earth’s crust in the ores of valentinite and stibnite.

Uses of Antimony

  • Pure antimony is used in the manufacturing of certain semiconductors like infrared detectors and diodes.
  • It is used to harden lead and increase its durability.
  • Batteries consist of antimony for smooth functioning.
  • It is also used to make small arms & bullets.
  • It is a very good flame retardant.

Properties of Antimony

  • The metallic form appears in a bright silver colour brittle and non-metallic form will appear as the grey powder.
  • It is a weak conductor of electricity and heat. The special feature of antimony and its alloys is that they expand on cooling.

Certain Health Facts About Antimony

  • It is toxic but does not have any harmful effects.
  • But constant exposure to this may cause some diseases like lung diseases, heart problems, and stomach ulcers.
  • Harmful effects of antimony upon body tissues and functions can occur following inhalation or ingestion of certain compounds of antimony. Such poisoning resembles arsenic poisoning.
  • Antimony poisoning has resulted from drinking acidic fruit juices containing antimony oxide dissolved from the glaze of enamelware containers.
  • The major toxic side effects of antimony as a result of therapy are cardiotoxicity and pancreatitis which is seen commonly in HIV and visceral leishmaniasis coinfections.

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Test Your Knowledge On Antimony!


  1. lorendz D. Magdaya

    Who discovered Antimony?

    1. The discovery of antimony is credited to Arabic alchemists before 800 AD

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