Easy
The electronic configuration of $Sc$ $(Z = 21)$ is:
- A$1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^1$
- B$1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^2$
- C$1s^2 2s^2 2p^6 3s^2 3p^6 4s^0 3d^3$
- D$1s^2 2s^2 2p^6 3s^2 3p^2 4s^2 3d^2$
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