Na+is isoelectronic with:
Mg2+
Ne
Al3+
N3-
Explanation for correct options:
(A) Mg2+:
(B) Ne:
(C) Al3+:
(D) N3-:
.Therefore, Na+ is isoelectronic with Mg2+, Ne, Al3+ and N3-. And the correct options are (A), (B), (C) & (D).