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3
Na:1s2/2s2/2p6/3s1
Pb:1s2/2s2/2p6/3s2/3p6/4s2/3d10/4p6/
5s2/4d10/5p6/6s2/4f14/5d10/6p2
C:1s2/2s2/2p2
Pb:1s2/2s2/2p6/3s2/3p6/4s2/3d10/4p6/
5s2/4d10/5p6/6s2/4f14/5d10/6p2
C:1s2/2s2/2p2
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