Ca: [20Ca] = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 = [18Ar] 4s^2
Li: [3Li] = 1s^2 2s^1 = [2He] 2s^1
Ar: [18Ar] = 1s^2 2s^2 2p^6 3s^2 3p^6
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Ca: [20Ca] = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 = [18Ar] 4s^2
Li: [3Li] = 1s^2 2s^1 = [2He] 2s^1
Ar: [18Ar] = 1s^2 2s^2 2p^6 3s^2 3p^6