Question

Give an example of three elements exhibiting variable valency.

Answer 1

Answer:

Explanation:

Element Symbol Valency

Copper Cu              1, 2

Silver Ag              1, 2

Mercury Hg              1, 2

Iron          Fe               2, 3

Answer 2

Answer

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Explanation:

carbon(4 to -4)

mangnese(6 or 7)

nitrogen(5 or -3)

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