Question

Define valency and give it's periodicity???
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Answer 1

In chemistry, the valence or valency of an element is a measure of its combining capacity with other atoms when it forms chemical compounds or molecules.

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Answer 2

Answer:

Trend of valency - definition

In a period, the number of valence electrons increases as we move from left to right side. However, in a group this periodic trend is constant, that is the number of valence electrons remains the same.

Explanation:

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