In a period the first element has the smallest size.
A
True
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B
False
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C
Either
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D
Neither
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Solution
The correct option is A False Atomic size decreases along a period.
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.
Nuclear charge dominates whilst adding electrons to the same shell. The net result is atomic contraction across a period.