Which element corresponds to each of the following electron configurations? (a) 1s 2 2s 1 (b)

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Which element corresponds to each of the following electron configurations?

(a) 1s2 2s1 

(b) 1s2 2s2 2p6 3s2 3p2 

(c) 1s2 2s2 2p6 3s2 3p6 4s2 3d2 

(d) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2.

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