To determine which symbol makes the statement true between \(5 \times 10^{-11}\) and \(3 \times 10^{-11}\), we can compare the two numbers.
Since \(5\) is greater than \(3\), we can conclude that:
\[5 \times 10^{-11} > 3 \times 10^{-11}\]
Therefore, the correct symbol to use in the blank is:
\[
\]
So, the complete statement is:
\[5 \times 10^{-11} > 3 \times 10^{-11}\]