The electronic configuration of the divalent calcium ion is;[tex]1s^2, 2s^2, 2p^6[/tex]. Option A
Calcium is an element found in group 12 of the periodic table. The group has elements that have a valence of 2. This means that they can lose electrons to form an ion.
Remember that an ion forms when there is a loss or gain of electrons in the atom. Now calcium forms an ion by loss of electrons, hence the positive sign.
The electronic configuration of the divalent calcium ion is [tex]1s^2, 2s^2, 2p^6[/tex] . Option A
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