A2 and B2 are two diatomic molecules with bond energies of A-A and B-B bonds as x and y respectively.If the bond energy of the molecule A-B formed up from A2 and B2 is z.Then,the resonance energy of molecules A-B will be
A.(∂E)A-B =z-√xy
B.(∂E)A-B =x-y-z
C.(∂E)A-B =z-x+y
D.(∂E)A-B =√xy-z
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