MHT CET 2024 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2024

What is the number of electrons present in d-subshell if its atomic number is 27 and oxidation state is +2?

(A)8
(B)7Correct
(C)6
(D)5

Answer: (B)

Solution

Cobalt (Z = 27) has the configuration . When a 3d-block element forms a cation, the 4s electrons are lost first. For the two 4s electrons are removed, giving

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Question ID VK-095014