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[He]
1s2
[Ne]
1s2 2s2 2p6
[Ar]
1s2 2s2 2p6 3s2 3p6
[Xe]
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
[Kr]
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6