Question

Which of the following pairs of ions represent isoelectronic species?

A) Na+ and Cl-
B) O2- and F-
C) K+ and Ca2+
D) Mg2+ and Al3+

Answer 1

The pair of ions that represent isoelectronic species is Mg2+ and Al3+.

Step-by-step explanation:

The correct pair of ions that represent isoelectronic species is Mg2+ and Al3+.

1. Both ions have the same number of electrons, which is 10, making them isoelectronic.
2. Mg2+ has a charge of 2+, meaning it has lost 2 electrons from its neutral state.
3. Al3+ has a charge of 3+, meaning it has lost 3 electrons from its neutral state.
4. By losing electrons, both ions have achieved a stable electron configuration similar to that of neon (Ne), with a filled outer electron shell.