(C) The atomic number of calcium $(Ca)$ is $20$. The electronic configuration of calcium is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$ or $(2, 8, 8, 2)$. The val

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(C) The atomic number of calcium $(Ca)$ is $20$. The electronic configuration of calcium is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$ or $(2, 8, 8, 2)$. The valence shell is the outermost shell,which is the $4^{th}$ shell. There are $2$ electrons in the $4s$ orbital of the valence shell.