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Q.

In which of the following pairs, the first atom is larger than the second?

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a

$Br, Cl$

b

$N, P$

c

$Sr, Ca$

d

$Na, Mg$

answer is A, B, C.

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Detailed Solution

Because atomic size grows from top to bottom in a group, Br's atomic size is bigger than Cl's. There are more shells in a group from top to bottom. As a result, the atomic size grows. As a result, Mg atoms in Na and Ca atoms in Sr are bigger.

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