The figure below shows the potential energy vs atom separation for a typical primary chemical

bond. Which of the following statements are true $($mark all that apply$)$

a$.$ The depth of the potential energy minimum of this curve sets the bond energy.

b$.$ The region with negative slope to the left of the minimum is repulsion arising from

core electron clouds in the two atoms resisting overlap.

c$.$ The equilibrium bond length is determined by where the curve crosses the x axis at

about $1\mathrm{.}6.$

d$.$ The curvature of the potential energy around the minimum sets the bond stiffness

and is correlated with the resulting material$$s Young$$s modulus.

e$.$ A deeper potential well correlates with lower melting temperature.