Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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If Neutrons Exert Only Attractive Force, Why Don'T We Have a Nucleus Containing Neutrons Alone? - Physics

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Question

If neutrons exert only attractive force, why don't we have a nucleus containing neutrons alone?

Solution

Nuclear forces are short range strong attractive forces that act between two proton-proton, neutron-proton and neutron-neutron pairs. Two protons have strong nuclear forces between them and also exert electrostatic repulsion on each other. However, electrostatic forces are long ranged and have very less effect as compared to the strong nuclear forces.
So, in a nucleus (that is very small in dimension), there's no such significance of repulsive force as compared to the strong attractive nuclear force. On the other hand, an atom contains electrons revolving around its nucleus. These electrons are kept in their orbit by the strong electrostatic force that is exerted on them by the protons present inside the nucleus. Hence, a nucleus contains protons as well as neutrons.

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APPEARS IN

 HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 24: The Nucleus
Short Answers | Q: 1 | Page no. 440
Solution If Neutrons Exert Only Attractive Force, Why Don'T We Have a Nucleus Containing Neutrons Alone? Concept: Atomic Masses and Composition of Nucleus.
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