Four potential-energy curves, W, X, Y, and Z, for different diatomic species have the following well depths (minimum energies) and equilibrium distances:
W: −944 kJ·mol⁻¹ at 0.109 nm
X: −158 kJ·mol⁻¹ at 0.197 nm
Y: −436 kJ·mol⁻¹ at 0.121 nm
Z: −769 kJ·mol⁻¹ at 0.099 nm
Rank the curves from strongest to weakest bond energy and provide a brief justification for the ordering.