Which of the following condensed electron configurations is not correct?
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Mg: [Ne] 3s²
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Fe: [Ar] 3d⁶
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Cu: [Ar] 4s¹ 3d¹⁰
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Br: [Ar] 3d¹⁰ 4s² 4p⁵
📝 Detailed explanation
The correct condensed electron configuration of iron is [Ar] 4s² 3d⁶. Therefore option B is incorrect.
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