Which Ground-State Electron Configuration Is Incorrect

question 73

Multiple Choice

Which ground-state electron configuration is incorrect?

• A) Br: [Ar]3d¹⁰4s²4p⁵
• B) K: [Ar]4s¹
• C) Ni: [Ar]3d⁵
• D) Mg: 1s²2s²2p⁶3s²
• E) Co: [Ar]3d⁷4s²

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