If you add too many neutrons to an atom, what happens to its nucleus?

Question

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It changes to a net charge of +1.
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It changes to a net charge of -1.
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Nothing happens; it remains stable and maintains a net charge of 0.
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It becomes unstable.

Answer 1

If you add too many neutrons to an atom, it becomes unstable. Neutrons increase the nuclear force that holds the nucleus together, but if there are too many neutrons relative to protons, the balance can be disrupted, leading to radioactive decay or the formation of an unstable isotope. So, the correct answer is:

It becomes unstable.