To compare \(5 \times 10^{-11}\) and \(3 \times 10^{-11}\), we can compare the coefficients \(5\) and \(3\) since they both have the same power of \(10^{-11}\).
Since \(5\) is greater than \(3\), we can conclude that:
\[5 \times 10^{-11} > 3 \times 10^{-11}\]
Thus, the correct symbol to make the statement true is \(>\).
So, the complete statement is:
\(5 \times 10^{-11} > 3 \times 10^{-11}\).