How many 'd' electrons are present in ${Cr}^{2 +}$ ion?

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answer is A.

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Detailed Solution

Cr, 24 is the atomic number (contains 24 electrons)

Cr⁺² indicating that 2 electrons have been lost, leaving a total of 22 electrons. As a result, the configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴, meaning that the d-orbital contains 4 electrons.

Hence, the correct option is (A).

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