Question

What discovery led J.J. Thomson to decide that atoms were not indivisible, but are actually composed of smaller parts? A:Thomson used a scanning tunneling micrograph to capture images of atoms. B:Thomson used a beam of negatively charged particles. C: Thomson used only the experimental results of other scientists.

Answer 1

Answer:

In 1897, the British physicist J. J. Thomson (1856–1940) proved that atoms were not the most basic form of matter. He demonstrated that cathode rays could be deflected, or bent, by magnetic or electric fields, which indicated that cathode rays consist of charged particles (Figure 2.2. 2).