Statement : The plot of atomic number ( y -axis ) versus number of neutrons ( x -axis ) for stable nuclei shows a curvature towards x-axis fron the line of ` 45^@` slope as the atomic number is increased .
Explanation : proton -proton electrostatic repulsions begin to overcome attracive forces involving protons and neutrons in heavier nuclides.

Options

A. S is correct but E is wrong
B. S is wrong but E is correct.
C. Both S and E are correct and E is correct explanation of S
D. Both S and E are correct but E is not correct explanation of S

Answer

A

Explanation

ltbr. If the curve does not bend down towards the x-axis then the proton -proton repulison would overcome the attractive forces of proton and neutron. Therefore, curve bends down to achieve stability of the between proton and neutron overcome proton -proton electrostatic repulsion.