Energy is released when a nucleus is formed from nucleons.
What is nucleus ?
In chemistry, a nucleus is the positively charged center of the atom consisting of protons and neutrons. It’s also known as the “atomic nucleus”. The word “nucleus” comes from the Latin word nucleus, which is a form of the word nux, which means nut or kernel. The term was coined in 1844 by Michael Faraday to describe the center of an atom. The sciences involved in the study of the nucleus, its composition, and characteristics are called nuclear physics and nuclear chemistry.
How nucleus is formed from nucleons?
To make a nucleus, multiple protons and neutrons have to be brought together. It is reasonable to assume that the nucleons are at least several diameters of protons apart before any nucleus is formed. Since the nuclear forces fall off much faster than the electrical forces over distances, there will always be electrical repulsion preventing the component protons from coming together (unless they are already really close which is unlikely).
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