Did J.J.Thompson do experiments to prove atoms cannot be divided?

No, J.J. Thomson did not conduct experiments to prove that atoms cannot be divided. In fact, his work in the late 19th century, particularly with cathode rays, led to the discovery of the electron, demonstrating that atoms are indeed divisible into smaller subatomic particles. This finding was pivotal in advancing the understanding of atomic structure, contradicting the notion of indivisible atoms.