lead

Introduction

lead, metallic chemical element; symbol Pb [Lat. plumbum ]; at. no. 82; at. wt. 207.2; m.p. 327.502°C; b.p. about 1,740°C; sp. gr. 11.35 at 20°C; valence +2 or +4. One of the oldest metals used by humanity, lead was known to the ancient Egyptians and Babylonians. The Romans used it for pipes and in solder. It was one of the first metals mined in North America, where it was sought after especially for making shot.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on lead Introduction from Fact Monster:

  • Helena Rubinstein - Helena Rubinstein cosmetics executive Born: 12/25/1870 Birthplace: Kraków, Poland Trained in ...
  • modem - modem modem [modulator/demodulator], an external device or internal electronic circuitry used to ...

See more Encyclopedia articles on: Compounds and Elements