Answer
$^{132}Xe$
Work Step by Step
$^{6}Li$ has 3 protons.
Since the isotope has 18 times as many protons, the isotope must have 54 protons. Therefore, the isotope must be an isotope of Xenon.
$^{12}C$ has 12 nucleons.
Since the isotope is 11 times as heavy as $^{12}C$, the isotope must have 132 nucleons.
The isotope is:
$^{132}Xe$
