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Predict the electron configurations of S, K ,Ti, Sn.

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1. S: 1s2 2s2 2p6 3s2 3p4 

2.  K: 1s2 2s2 2p6 3s2 3p6 4s1 

3. Ti: 1s2 2s2 2p6 3s2 3p6 3d2 4s2 

4. Sn: 1s2 2s2 2p6 3s2 3p6 3d104s2 4p6 4d105s2 5p2 

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