Question

give reason velency is always a whole number?
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Answer 1

Valency of an atom is the number of electrons donated or taken up in the formation of a bond. Valency is always a whole number because the number of electrons donated or shared cannot be fractional.

Answer 2

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Valency is defined as the combining capacity of an element (or) the electrons that can be shared (or) transferred from one atom to another atom . Electrons tansferred from one atom to another atom can't be fractional (or) in decimals. So, we can say that the valency is always a whole number.

Let' see some examples in which elements possess a whole number as valency.

Example(1) : NaCl

In NaCl Sodium loses one elctron which is accepted by chlorine.

Hence , In this case valency of sodium and chlorine are +1 and -1.

Example(2) : CaCl₂

In this compound , Calcium loses two electrons and those two electrons are gained by each chlorine atom.

Hence , In this case the valency of calcium and chlorine are 2 and 1.