The number of d-electrons in Fe2+ (Z = 26) is not equal to that of____________?
Correct answer: D. p-electrons in CI(Z = 17)
- 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)
Explanation
Fe has the configuration [Ar] 3d6 4s2, so Fe2+ loses the 4s electrons and has six 3d electrons. Ne has six p-electrons, Mg has six s-electrons in total, and neutral Fe has six d-electrons, whereas Cl has 12 p-electrons. Hence option d is the only unequal value; students may choose c by incorrectly removing electrons from neutral Fe before comparing it.
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