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1 2 s. 1s2 2s2 2p6. 1s22s22p6. 1s2 2s2 2p6 3s2 3p. 1s2 2s2 2p6 3s2 3p6 3d10 4s2.
1s2 2s2 2p6. 1s22s22p6. 1s2 2s2 2p6 3s2 3p. 1s2 2s2 2p6 3s2 3p6 3d10 4s2.

See also