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Q.

What is the trend of atomic radius across a period?

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a

decreases

b

remains the same

c

first decreases then increase

d

increases

answer is B.

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Detailed Solution

In a period, the size of an atom decreases from left to right. This is because the nuclear charge, i.e., the atomic number increases from left to right in the same period, thereby bringing the outermost shell closer to the nucleus. Therefore, in the second period, it has been found that lithium (Li) has the largest atomic size while fluorine (F) has the smallest.

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