Question

Name two elements that have variable valency.Give the formulae and names of two compounds formed by each of these elements.
$nae \: two \: elements \: that \: have \: variabe \: valency \: give \: the \: formule \: an \: names \: of \: two \: compounds \: formed \: by \: ech \: of \: these \: elements$
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Answer 1

Explanation:

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Answer 2

Answer:

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Explanation:

Variable Valency

Certain elements have more than one valency. They exhibit variable valency. For example, copper, tin, iron and mercury exhibit variable valency. Copper combines with oxygen to form cuprous oxide (Cu2O) and cupric oxide (CuO).

Valency of oxygen being two, combining capacity of copper in the first case is one and that in the second case is two. The suffix “ous” is used to indicate the lower valency and the suffix “ic” to indicate the higher valency. The following table gives the names of some compounds with variable valencies of elements.

Compound  

Cuprous (Cu2O)

Cupric oxide (CuO)

Ferrous oxide (FeO)

Ferric oxide (Fe2O3)