The process of fusion is when two atoms combine to form a lager atom, releasing energy.
Fusion is defined as the mixing of two lighter nuclei to form one bigger and heavy nuclei. For example, two atoms of hydrogen combine together to form the helium atom. It is also termed as transmutation, as one form of element is transformed into another.
An atom is the smallest unit of any substance. It cannot be further broken down into simpler units. The composition of an atom includes various subatomic particles. These are: a nucleus surrounded by various electrons. Nucleus itself is made up of two subatomic particles: protons and neutrons.
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