\textbf{200-} Which statement about $^{235}$U and $^{238}$U is \underline{not} correct?
\begin{enumerate}
\item The number of neutrons in $^{238}$U is greater.
\item Both have the same number of protons.
\item Both have the same chemical properties.
\item $^{238}$U, $0.72\%$ forms natural uranium.
\end{enumerate}
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