The number of isotopes that are existed for both Xenon and Cesium are

The elements Xenon and Cesium (Cs) have 36 isotopes for each one.

Ex: ${ }^{1\text{2}4}\text{Xe}{,}^{126}\text{Xe}{,}^{136}\text{Xe}$and  ${ }^{131}\text{Cs}{,}^{132}\text{Cs}{,}^{133}\text{Cs}$.