Question

Explain the formation of ionic compound CaO with electron dot structure.atomic no. of Ca and O are 20 and 8 respectively.

Answer 1

Calcium loses its two valence electrons to oxygen and oxygen accepts the electrons. Thus both the atom becomes stable by completing their octet structure.
   .        .                                                  ..
Ca  + : O :   -----------------------⇒ Ca2 + :O: 2-
            .                                                  ..