Describe how the strong nuclear force between two nucleons varies with the separation of the nucleons, quoting suitable values for separation.

The strong nuclear force is repulsive for nucleon separations less than 0.5 femtometres but doesn't act at roughly 1 femtometre. It becomes attractive between 1 femtometre and 3-4 femtometres, afterwhich it is non existent due to its range being less than this.