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Which of the following are NOT correct electronic configurations for s-block elements?

1. [Ar] 3d¹⁰ 4s²
2. [Ar] 3d¹⁰ 4s¹
3. [Ar] 4s²
4. [Ar] 4s¹

Correct answer: [Ar] 3d¹⁰ 4s²

Solution

[Ar] 3d¹⁰ 4s² is the configuration of Zinc (a d-block element) and [Ar] 3d¹⁰ 4s¹ is the configuration of Copper (also d-block). Both contain 3d electrons and are therefore NOT s-block elements.

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