ferric

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ferric

(fĕr`ĭk), ironiron,
metallic chemical element; symbol Fe [Lat. ferrum]; at. no. 26; at. wt. 55.845; m.p. about 1,535°C;; b.p. about 2,750°C;; sp. gr. 7.87 at 20°C;; valence +2, +3, +4, or +6. Iron is biologically significant.
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 in the +3 valencevalence,
combining capacity of an atom expressed as the number of single bonds the atom can form or the number of electrons an element gives up or accepts when reacting to form a compound.
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 state.
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ferric

[′fer·ik]
(inorganic chemistry)
The term for a compound of trivalent iron, for example, ferric bromide, FeBr3.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ferric

of or containing iron in the trivalent state: ferric oxide; designating an iron(III) compound
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

ferrous

Containing or having to do with iron. The difference between ferrous and ferric is the number of valence electrons they contain (ferrous contains two and ferric contains three), which combine with other atoms to form molecules. See ferromagnetic, ferroelectric and ferric oxide.
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