Topic: phosphorus

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phosphorus

The Columbia Encyclopedia, Sixth Edition
phosphorus [Gr.,=light-bearing], nonmetallic chemical element; symbol P; at. no. 15; at. wt. 30.97376; m.p. 44.1°C; b.p. about 280°C; sp. gr. 1.82 at 20°C; valence -3, +3, or +5. Solid phosphorus has a tetratomic molecule (P 4 ) with molecular weight 123.8952 atomic mass units (amu). Phosphorus was discovered c.1674 by Hennig Brand of Hamburg, an alchemist, who prepared it from urine. Phosphoric acid was discovered in 1770 by K. W. Scheele and J. G. Gahn in bone ash (see ash ); Scheele later isolated phosphorus from bone ash (1774) and produced phosphoric acid by the action... Read more
Phosphorus (revised)
Chemical Elements: From Carbon to Krypton PHOSPHORUS (REVISED) Note: This article, originally published in 1998, was updated in 2006 for the eBook edition. Overview Phosphorus is found in Group 15 (VA) of the periodic table. The ... shows how chemical elements are related to each other. Phosphorus is part of the nitrogen family along with nitrogen ... Read more
Phosphorus
Chemistry: Foundations and Applications Phosphorus melting point: 44.1 ° C boiling point: 280 ° ... − , H 2 PO 3 − , PO 4 3 − The element phosphorus is essential to living organisms. It is part of the ... and its compounds have many commercial applications. Phosphorus was first isolated by the alchemist Hennig Brand of ... Read more

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Andrew Lessman's Calcium-Magnesium-Phosphorus Intensive...