What will be Stablity order of ionic bond in nacl and mgF2 ? Explain in detail

Nacl will be more stable than mgf2 . 
as u can refer in the case of nacl , the interionic attraction are larger than that of mgf2 . and the lower the value of potential energy , the more stable the ion is . 
and in the case of nacl ,its greater . and nacl is much more stable due to its solid structure and enthalpy is nearly equal to 787 KJ / MOL . 
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