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Na: 1s^2, 2s^2, 2p^6, 3s^1 or, Na: [Ne] 3s^1 Sr: 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^10, 4p^6, 5s^2 or, Sr: [Kr] 5s^2 P: 1s^2, 2s^2, 2p^6, 3s^2, 3p^3 or, P: [Ne] 3s^2, 3p^3

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