What is the best definition of nuclear fusion?

A. the creation of high-energy plasma

B. the splitting of the atomic nucleus into parts

C. the process of two or more atomic particles sticking together to form a heavier atomic nucleus

The correct option is C.

Explanation:

Nuclear fusion is a radioactive reaction - radioactivity involves the nucleus of an atom NOT the electrons. Nuclear fusion is the process in which two or more light atomic nuclei combine together to form a heavier atomic nucleus with the release of large amount of energy.

An example of a nuclear fusion reaction is shown below

³₁H + ²₁H ⇒ ⁴₂He + ¹₀n + energy

The answer is the process of two or more atomic particles sticking together to form a heavier atomic nucleus that is C.

Explanation:

Nuclear fusion happens when there are two or more particles join to produce one big or heavier atom.