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Q.

Assertion (A) Na+and Al3+ are isoelectronic.Reason (R) The nuclear attraction on the outermost shell electrons of Al3+ is greater than that of Na+.

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a

Both A and R are correct; R is the correct explanation of A.

b

Both A and R are correct; and R is not the correct explanation of A.

c

A is correct; R is incorrect.,

d

R is correct; A is incorrect.

answer is A.

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Detailed Solution

Na+and Al3+ have 10 electrons, so, these are called isoelectronic species and the effective nuclear charge (ENC) value of Al3+ is greater than ENC value of Na+ due to larger positive charge in Al3+. + ve charge ∝ ENC
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