Question

Give two examples for each of the following:

a) Polyatomic molecules

b) Variable valency element

c) Cation with valency 4
​

Answer 1

Explanation:

A polyatomic ion, also known as a molecular ion, is a charged chemical species(ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered to be acting as a single unit.

Eg: SO

4

2−

, CO

3

2−

.

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Answer 2

Answer:

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Explanation:

a) Carbon dioxide (CO2) and water (H2O).

b) iron, copper, tin and mercury.

c) magnesium (mg), calcium (ca) and Brelliym (be) .