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The number of d-electrons in Fe²⁺ (Z = 26) is ...

The number of d-electrons in Fe²⁺ (Z = 26) is not equal to that of

A.

p-electrons in Ne(Z = 10)

B.

s-electrons in Mg(Z = 12)

C.

d-electrons in Fe(Z = 26)

D.

p-electrons in CI(Z = 17)

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Correct answer is D

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