Question

valency across a period __________ gradually
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Answer 1

Answer:

Increases

Explanation:

Ans. As the atomic number increases, the number of valence electrons increases.The first element has one electron in its outermost shell while the last element in a period has either completed duplet or octet.

Answer 2

Answer:

first increases then decreases

Explanation:

It is due to metallic and non metallic properties of the elements