JUPEBChemistryAtomic Structure and Periodicity

Across a period from left to right in the Periodic Table, the atomic radius generally

Astays constant because the number of shells is the same.
Bdecreases because nuclear charge increases while shielding stays roughly constant.CORRECT
Cincreases because electronegativity increases.
Dincreases because more electrons are added.
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Why the answer is B, and why the others tempt you.
Electrons are added to the same shell while protons are added to the nucleus, so the increasing nuclear charge pulls the outer electrons closer and the radius shrinks. The same number of shells does not mean the same size.
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