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Which one of the following ions has electronic configuration [Ar] 3d4?

1. Ni3+
2. Mn3+
3. Fe3+
4. Co3+

Correct answer: Mn3+

Solution

Mn has an atomic number of 25, so its electronic configuration is [Ar] 3d5 4s2. Removing three electrons (for Mn3+) results in [Ar] 3d4.

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