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Listen what i can understand from this question without calculating anything is that the second equation shows the enthalpy change of atomization which is an endothermic process (the value is +ve) and the only value which is positive is DSorry I can't.all I can say is that for option a charge on the cation will only determine strength of metallic bonding and lattice energy.ratio of charge will only tell the formula.like Mg has charge +2 and cl-1 so compound formula will be mgcl2.Option c seems appropriate.never heard anything like sum of charges so no simply.