The common oxidation number for an alkaline earth metal is +2.Aided by the Born-Mayer equation for lattice energy and aBorn-Haber cycle, illustrate that CaCl is an exothermic compound, Use a appropriate analogy to estimate an ionic radius for Ca+. The sublimation enthalpy of Ca(s) is 176 kJ/mol. Depict that an explanation for the nonexistence of CaCl can be found in the enthalpy change of the reaction
2CaCl(s) --> Ca(s) + CaCl2(s)