Question

How does atomic radius change from left to right across a period explain?

Answer 1

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Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across a period. ... Atomic radius increases from top to bottom within a group. This is caused by electron shielding.

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Answer 2

Explanation:

On going f left to right across a period, atomic radius decreases as one proton and one electron are added continuously, therefore effective nuclear charge increases.