Question

explain the variation of atomic size in a group and in a period ?
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Answer 1

Answer:

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Explanation:

Atomic size decreases across a Period from left to right as we face the Table, but INCREASES down aGroup, a column of the Periodic Table. ... And thus across the Period nucular charge predominates, and draws the valence electrons towards the nuclear core, with the result of a marked decrease in atomic radius.

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