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$STATEMENT-1$: The plot of atomic number ( $\mathrm{y}$-axis) versus number of neutrons ( $\mathrm{x}$-axis) for stable nuclei shows a curvature towards $x$-axis from the line of $45^{\circ}$ slope as the atomic number is increased. and $STATEMENT-2$: Proton-proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons and neutrons in heavier nuclides.
$STATEMENT-1$ is True, $STATEMENT-2$ is True; $STATEMENT-2$ is correct explanation for $STATEMENT-1$
$STATEMENT-1$ is True, $STATEMENT-2$ is True; $STATEMENT-2$ is $NOT$ a correct explanation for $STATEMENT-1$
$STATEMENT-1$ is True, $STATEMENT-2$ is False
$STATEMENT-1$ is False, $STATEMENT-2$ is True
Solution
$Image$
If the curve does not bend down towards the $\mathrm{x}$ axis then the proton-proton repulsion would overcome the attractive force of proton and neutron. Therefore, the curve bends down.
