How many electrons are in the outermost shell of a Chlorine…

How many electrons are in the outermost shell of a Chlorine (Cl) atom? [chlorine] How many electrons are in the outermost shell of a Sodium (Na) atom? [sodium] If you combined Chlorine and Sodium atoms would they be more likely to form ionic bonds or covalent bonds? [bonds] Would a Magnesium (Mg) atom be more likely to donate or accept electrons? [magnesium]