Question

Name two elements that have variable valency . give the formula and names of two components formed by each of these elements.

Answer 1

Answer:

For covalent compounds the chemical formula is also called ... valency of an element is the measure of the combining...most elements have fixed valency.... of 4 of the carbon atom with 2 atoms of oxygen , each of valency 2.

Answer 2

Answer:

Iron and copper have variable valency.

Components formed by copper are copper(I) oxide[Cu2O] and copper(II) oxide[CuO]

Components formed by iron are ferric oxide(Fe2O3) and ferrous oxide(FeO)

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