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Work Step by Step
The data translates into: a) $1s^2\ 2s^2\ 2p^6\ 3s^1$: Na b) $1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 4s^2$: Ca c) $1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6\ 3d^3\ 4s^2$: V
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