Question

3) What is valency of an element, why is it necessary for forming a bond with other element?
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Answer 1

Valency is the combining capacity of an element.Do become stable an element need an octet in the last shell. So, valency is important.

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Answer 2

The valency of an element is the no. of electrons it loses or gains while forming a compound. elements that lose electrons are said to have a positive valency, while elements that gain electrons are said to have a negative valency. e.g, valency of sodium is +1 and chlorine is -1.