200- Which of the following statements about atomic nuclei is correct?
[(1)] Most isotopes are unstable and decay over time.
[(2)] Nuclear (strong) forces are very short-range compared to Coulomb forces.
[(3)] The mass of a nucleus equals the total mass of the nucleons forming it.
[(4)] The ratio of neutrons to protons is the same for all stable isotopes of an element.
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\textbf{200-} Which of the following statements about atomic nuclei is correct?
\begin{enumerate}
\item[(1)] Most isotopes are unstable and decay over time.
\item[(2)] Nuclear (strong) forces are very short-range compared to Coulomb forces.
\item[(3)] The mass of a nucleus equals the total mass of the nucleons forming it.
\item[(4)] The ratio of neutrons to protons is the same for all stable isotopes of an element.
\end{enumerate}
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