how to draw orbital structure of Calcium oxide, Nitrogen and also of Methane

Dear student, 
Calcium oxide (CaO)- The bond between oxygen and calcium in calcium oxide is electrovalent pr ionic in nature. The valence shell of Calcium has 2 electrons while that of oxygen has 6 electrons. Calcium being a metal loses two electrons to become Ca2+ ion and achieves octet while oxygen being a non-metal accepts the 2 electrons from calcium to form oxide ion(O-2) to achieve octet. 

Please ask the remaining question in a different thread. 
Regards
 

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