Final answer:
The strong nuclear force, electromagnetic force, and gravity hold an atom together through binding energy.
Explanation:
The force responsible for holding an atom together is the strong nuclear force, the electromagnetic force, and gravity. The strong nuclear force is an attractive force that keeps the particles of the nucleus tightly bound together.
If particles come together under the strong nuclear force and unite to form an atomic nucleus, some of the nuclear energy is released, known as the binding energy of the nucleus.
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