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1s2 2s2 2p6. 1s1 2s2 2p6. 1s 2s. 1s2 2s2 p6 3s2 p3.
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1s2 2s2 2p6. 1s1 2s2 2p6. 1s 2s. 1s2 2s2 p6 3s2 p3. 