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Atomic Structure and Electron Configuration

AP Chemistry· difficulty 3/5

The electron configuration of Fe (Z = 26) is

  • A

    [Ne] 4s² 3d⁶

  • B

    [Ar] 4s² 3d⁶

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  • C

    [Ar] 4s¹ 3d⁷

  • D

    [Ar] 3d⁸

Explanation

[Ar] = 18 electrons. Fe has 26 → adds 4s² (2 e⁻) + 3d⁶ (6 e⁻).

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