H:1s1
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 Na:1s2 2s2 2p6 3s1
Mg:1s2 2s2 2p6 3s2
Al:1s2 2s2 2p6 3s2 3p1
Si:1s2 2s2 2p6 3s2 3p2
P:1s2 2s2 2p6 3s2 3p3
S:1s2 2s2 2p6 3s2 3p4
Cl:1s2 2s2 2p6 3s2 3p5
Ar:1s2 2s2 2p6 3s2 3p6
K:1s2 2s2 2p6 3s2 3p6 4s1
Ca:1s2 2s2 2p6 3s2 3p6 4s2
