Periodic Table of the Elements: Lead


Name: Lead
Symbol: Pb
Atomic Number: 82
Atomic Mass: 207.19
Atomic Volume: 18.27 cc/mol
Discovered By: Prehistoric
Discovery Date: Lead has been known since ancient times, it is mentioned in the Old Testament, and lead plates were found in the tomb of Ramses II
Origin of Name: Lead - (Anglo-Saxon) lead, the symbol Pb comes from (Latin) plumbum (lead) (Plumbum is also the root of the word plumbing)
Toxicity: Toxic. All salts are toxic and are protoplasmic poisons.
Summary: Rarely found free in Nature, usually as ores. Tarnishes on exposure to air. Used in lead-acid batteries, ammunition, and in solders. Once used in lead tetraethyl, a gasoline anti-knock compound, and in plumbing pipes. Lead compounds were once used as pigments in lead-based paints.

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