Which of the following electron configurations are associated with increased stability? Select all that apply.
1) 1s² 2s² 2p⁶
2) 1s² 2s² 2p⁶ 3s² 3p⁶
3) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰
4) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

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