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He= 1S2
Li= 1s2-2s1
Be= 1s2-2s2
B= 1S2-2S2-2P1
C= 1S2-2S2-2P2
N=1S2 -2S2-2P3
O=1S2-2S2-2P4
F=1S2-2S2-2P5
Ne= 1S2-2S2-2P6
OK