Question

Assertion :The plot of atomic number ($y$-axis) $vs$. number of neutrons ($x$-axis) for stable nuclei shows a curvature towards $x$-axis from the line of ${45}^{\circ }$ slope as the atomic number is increased. Reason: Proton-proton electrostatic repulsion begins to overcome attractive forces involving proton and neutrons in heavier nucleides.

• 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 1

The correct option is C Both $S$ and $E$ are correct and $E$ is correct explanation of $S$

With increase in the atomic number, the proton-proton electrostatic repulsion begins to overcome attractive forces involving proton and neutrons in heavier nucleides.
Hence, the plot of atomic number (y-axis) vs. number of neutrons (x-axis) for stable nuclei shows a curvature towards x-axis from the line of ${45}^{\circ }$ slope .
Thus, Both S and E are correct and E is correct explanation of S.