He
1s^2
Li
1s^2 2s^1
Be
1s^2 2s^2
B
1s^2 2s^2 2p^1
Na
1s^2 2s^2 2p^6 3s^1
Mg
1s^2 2s^2 2p^6 3s^2
Al
K
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
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He
1s^2
Li
1s^2 2s^1
Be
1s^2 2s^2
B
1s^2 2s^2 2p^1
Na
1s^2 2s^2 2p^6 3s^1
Mg
1s^2 2s^2 2p^6 3s^2
Al
1s^2 2s^2 2p^6 3s^1
K
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1