The energy order is given as :NaCl<KNO3<CaS<CaO<MgCl2
What is potential energy for ionic compounds?
The potential energy is defined as when oppositely charged ions brought near from infinity to a finite distance , the energy of the system is lowered
E= kq1q2/d
q1= charge on cation
q2= charge on anion
d= radius of cation + anion
Cation charge order
Na⁺ < K⁺< Mg²⁺
Na is in least because Na has less size than K.
Anion order
Cl⁻<NO3⁻<O²⁻<S²⁻
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