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The potential energy of a pair of hydrogen atoms separated
by a large distance x is given by U(x) = -C6/x6, where C6 is a
positive constant. What is the force that one atom exerts on the other? Is
this force attractive or repulsive?

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The potential energy of a pair of hydrogen atoms separated by a large distance x is given by U(x) = -C6/x6, where C6 is a positive constant. What is the force that one atom exerts on the other? Is this force attractive or repulsive?