Sodium chloride comprises 97%-99% of table salt. given their location on the periodic table, identify the ionic charge for each element and predict the chemical formula of the compound formed. a) sodium, na, is an alkali metal and is in group ia with an ionic charge of +1. while chlorine, cl, is a halogen and is in group viia with a charge of -1. these will form nacl(s). b) sodium, na, is an alkaline earth metal and is in group ia with an ionic charge of +2. while chlorine, cl, is a halogen and is in group viia with a charge of -1. these will form nacl2(s). c) sodium, na, is an alkali earth metal and is in group ia with an ionic charge of +2. while chlorine, cl, is a noble gas and is in group via with a charge of -2. these will form na2cl2(s). d) sodium, na, is an alkali earth metal and is in group ia with an ionic charge of +1. while chlorine, cl, is a diatomic gas and is in group via with a charge of -2. these will form na2cl(s).