Question

Define valency and describe the variation in a periodic table.​

Answer 1

Answer:

VALENCY

The combining power of an element especially as measured bt the number of hydrogen atoms it can displace or combin

VARIATIONS IN A PERIODIC TABLE

The elements in a group of the periodic table exhibit similar chemical behavior, as we go down the elements in a group, the number of electrons in the valance shell remains constant, but the principle quantum number increases by one each item.

Explanation:

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Answer 2

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

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