How many electrons are required or released by each atom mentioned in (a) to attain the nearest noble gas configuration ?

How many atoms of each kind are present in the following molecules : calcium oxide, chlorine, water, carbon tetrachloride ?

Elements Q and S react together to form an ionic compound. Under normal conditions, which physical state will the compound QS exist in ?

Elements Q and S react together to form an ionic compound. Can Q and S, both be metals ? Justify your answer.