Question

6. What is meant by atomicity ? Name a diatomic element.
7. (a) Explain the terms 'valency' and 'variable valency'.
(b) How are the elements with variable valency named ?
Explain with an example.​

Answer 1

(6) Atomicity is defined as the total number of atoms that constitute a molecule. ... Diatomic-composed of 2 atoms e.g. H2 , N2 , O.

7(a) Valency is defined as the combining capacity of an element. ... Some elements differ in their capacity to combine with other elements depending on the nature of the reaction; this property is called variable valency. For example, Iron (Fe) can have a valency of both 2 and 3.

(b) Valency of an element is decided by numer of outermost shell electrons. If an element exhibit more than one valency . This is known as variable valency.

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