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Across a period from left to right, atomic radius generally:
AIncreases, since more electrons fill the same shell here
BStays constant, since the period houses one outer shell
CIncreases then decreases, with a peak in the middle
DDecreases, since the nuclear charge rises but shell number does not
Answer & Solution
Correct answer: D. Decreases, since the nuclear charge rises but shell number does not
More protons pull the same shell tighter, so radius decreases left to right.
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