Statement 1 The plot of atomic number ( Y -axis) versus number of neutrons ( x -axis) for stable nuclei shows a curvature towards X -axis from the line of 45^ slope as the atomic number is increased. Statement 2 Proton-proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons in heavier nuclides.

Step-by-step solution

The stability relationship can be represented by a line with a slope of 45^ , i.e. the maximum stability is attained, when N=Z . Right or the curve a radioactive nuclide would be neutron rich and would decay be -emission to produce a daughter nucleus with a lower n p ratio. For heavier nuclides, p-p repulsions start to offset the attractive forces and an excess of neutrons over protons, is required for stability