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The count of d-electrons in Fe2+ differs from the number of:

1. d-electrons in an Iron atom
2. p-electrons in a Neon atom
3. p-electrons in a Chlorine atom
4. s-electrons in a Magnesium atom

Correct answer: p-electrons in a Chlorine atom

Solution

The number of d-electrons in Fe2+ is 6, which differs from the number of p-electrons in a Chlorine atom, making it the correct comparison.

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