Question

Which of the following pairs contains an isoelectronic species? (More than one option can be correct)
I. Na+, Mg2+
II. Al3+, O–
III. Na+, O2–
IV. N3–, Cl–

Answer 1

Answer:

Option 1 is the ans

Explanation:

Isoelectronic species should contain same no of electrons with same configuration but different nuclear charge, as we can see Na having positive charge and magnesium having 2 positive charges. In case of Na+ total no of electron is 10 and in Mg2+ also no of electron is 10. So both are isoelectronic pair.