The electron configuration of calcium in its neutral state is 1s2 2s2 2p6 3s2 3p6 4s2.
When calcium loses two electrons to become Ca+2, the two electrons are removed from the highest energy level, which is the 4s orbital.
Therefore, the electron configuration of Ca+2 is 1s2 2s2 2p6 3s2 3p6.
Electron configuration of Calcium ^+2
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