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Question
Which of the following ions has the electronic configuration 3d6?
(Atomic number: Mn = 25, Co = 27, Ni = 28)
Options
Ni3+
Co3+
Mn2+
Mn3+
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Solution
Co3+
Explanation:
Electronic configuration of Ni3+ = [Ar] 3d7, Co3+ = [Ar] 3d6, Mn3+ = [Ar] 3d4 and Mn2+ = [Ar] 3d5
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