Question

what does atomic size decrease as we move from left to right along a period in the periodic rable
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Answer 1

Answer:

According to ChemWiki at UC Davis, "Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. As a result, the atomic radius decreases. Nuclear charge increases due to protons NOT electrons.

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Answer 2

Answer:  Because all electrons are added to the same shell.

Explanation:

Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus.