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Which of the following electronic configurations corresponds to Ni3+?

1. Ni3+: [Ar] 3d7
2. Mn3+: [Ar] 3d4
3. Fe3+: [Ar] 3d5
4. Co3+: [Ar] 3d6

Correct answer: Ni3+: [Ar] 3d7

Solution

Ni (atomic number 28) has the configuration [Ar] 3d8 4s2. Removing three electrons (two from 4s and one from 3d) gives Ni3+: [Ar] 3d7.

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