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Atomic Structure and Electron Configuration

AP Chemistry· difficulty 3/5

Using noble-gas notation, the configuration of sodium (Z = 11) is

  • A

    [He] 2s² 2p⁶ 3s¹

  • B

    [Ar] 3s¹

  • C

    [Ne] 3s¹

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  • D

    [Ne] 2s¹

Explanation

Sodium has 11 electrons: [Ne] (10 e⁻) + 3s¹.

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