• Name: Lead • Atomic Number: 82 • Chemical Symbol: Pb • Atomic Mass: 207.2 • Colour: Blueish-white when fresh, blueish-grey to dark grey when oxidised Lead is one of the oldest metals known, being one of seven metals used in the ancient world (the others are gold, silver, copper, iron, tin, and mercury). Its low melting point of 327 C, coupled with its easy castability and softness and malleability, make lead and lead alloys especially suitable for a wide range of cast …showed first 75 words of 1642 total…

…showed last 75 words of 1642 total…this process, the litharge takes on more oxygen to form red lead. Lead dioxide (PbO2) is an oxidizing agent used in the manufacture of dyes, matches, and rubber substitutes. Orange mineral (Pb3O4), having the same chemical composition as red lead but differing in colour and tone, is exploited in the manufacture of printing inks and pigments. Black oxide is a mixture of litharge and finely divided metallic lead and is mainly used in batteries.