Easy
The electronic configuration of calcium ion $(Ca^{2+})$ is
- A$1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^2$
- B$1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^1$
- C$1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^2$
- D$1s^2, 2s^2 2p^6, 3s^2 3p^6$
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