There are 24 electrons in Mn^+, Cr, Co^ 3+ , Fe^ 2+ , Ni^ 4+ . How many of these have d^5 configuration?

JEE Main Chemistry question

There are 24 electrons in Mn^+, Cr, Co^{3+}, Fe^{2+}, Ni^{4+}. How many of these have configuration?

Answer: 2

Removing electrons before electrons: (5 -electrons) and neutral (5

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Question ID VK-147515