Question

All of the following pairs of ions are isoelectronic except which one?
A) Al+ and N3-
B) Fe2+ and Co3+
C) Fe2+ and Mn3+
D) K+ and Ca2+
E) Zn2+ and Cu+

Answer 1

Answer: Fe2+ & Mn3+

Explanation:

Answer 2

The pair of ions that are not isoelectronic is  Fe2+ and Mn3+.

Isoelectronic ions are ions that have the same number of electrons. In order to decide which of the species are not isoelectronic, we must look at the options carefully.

If we count the number of electrons in each pair of ions, we will discover that  Fe2+ has 24 electrons while Mn3+ has 22 electrons. These two species do not have the same number of electrons hence they are not isoelectronic.

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