Answer: An atom is stable if the forces among the particles that makeup the nucleus are balanced. An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy and is unstable.
Explanation: I HOPED THAT HELPED!
The primary factor determining whether an atom is stable or unstable is the forces between the particle.
An atom is the smallest indivisible particle that makes up an element.
An atom is said to be stable if the forces between the particles of the nucleus are balanced. Whereas, an atom is unstable if its forces are unbalanced.
The instability of an atom is due to the excess of either neutrons or protons.
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