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