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2. Ca 20e, 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 [Ar] 4s^2
3. N 1s^2 2s^2 2p^3 [He]2s^2 2p^3
Al 1s^2 2s^2 2p^6 3s^2 3p^1 [Ne] 3s^2 3p^1
Ar 1s^2 2s^2 2p^6 [Ar]
Br 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5 [Ar] 4s^2 3d^10 4p^5
Ca 2+ 1s^2 2s^2 2p^6 [Ar]
S 2- 1s^2 2s^2 2p^6 [Ar]