Arrange these in the correct order: 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 4p⁶, 4d¹⁰

University of Ilorin CHM101 2025B past question

1. 1s² < 2s² < 2p⁶ < 3s² < 3p⁶ < 4s² < 4p⁶ < 4d¹⁰
2. 1s² < 2s² < 2p⁶ < 3s² < 4s² < 3p⁶ < 4p⁶ < 4d¹⁰
3. 1s² < 2p⁶ < 2s² < 3p⁶ < 3s² < 4s² < 4d¹⁰ < 4p⁶
4. 1s² < 2s² < 3s² < 3p⁶ < 2p⁶ < 4s² < 4p⁶ < 4d¹⁰

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