write the valency / valencies of the following :- (a) Hydrogen (b) carbon (c) Nitrogen (d) phosphorus (e) Iron (f) copper (g) sulphur (h) lead
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(a) Hydrogen = 1
(b) Carbon = 4
(c) Nitrogen = 3
(d) Phosphorous = 3,5
(e) Iron = 3
(f) Sulphur = 2
(g) lead = 4,2
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