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2He= 1s2
3Li=1s2 2s1
4Be=1s2 2s2
5B=1s2 2s2 2p1
6C=1s2 2s2 2p2
7N=1s2 2s2 2sp3
8O=1s2 2s2 2sp4
9F=1s2 2s2 2p5
10Ne=1s2 2s2 2p6
11Na=1s2 2s2 2p6 3s1
12Mg= 1s2 2s2 2p6 3s2
13Al= 1s2 2s2 2p6 3s2 3p1
14Si=1s2 2s2 2p6 3s2 3p2
15P=1s2 2s2 2p6 3s2 3p3
16S=1s2 2s2 2p6 3s2 3p4
17Cl= 1s2 2s2 2p6 3s2 3p5
18Ar= 1s2 2s2 2p6 3s2 3p6
19K= 1s2 2s2 2p6 3s2 3p6 4s1
20Ca= 1s2 2s2 2p6 3s2 3p6 4s2