What are the isotopes of chlorine? How do they differ from each other?

(N/A) The isotopes of chlorine are ${ }_{17}^{35} Cl$ and ${ }_{17}^{37} Cl$.
Isotopes: ${ }_{17}^{35} Cl$ and ${ }_{17}^{37} Cl$.
Mass number: $35$ and $37$.
Number of neutrons: $18$ and $20$.
They differ in their mass numbers due to the difference in the number of neutrons present in their nuclei.