Question

Assertion :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 ${45}^o$ slope as atomic number is increased. Reason: Proton-proton electrostatic repulsion begin to overcome attractive forces involving protons and neutrons in heavier nuclides.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Reason is correct but Assertion is incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

In heavier nuclei, attractive forces between proton-neutron overcome proton-proton electrostatic repulsion.