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However, at the end of the XIX century it was made a number of discoveries, which showed that the atom is not an indivisible particle, but is composed of subatomic particles. The first of these findings the study was based on the rays emitted by a negatively charged electrode. The existence of these cathode rays was demonstrated in the 70-ies of the XIX century in a number of experiments, Ko ■ torye performed Crookes and Goldstein. For example, in the experiment with the impeller Crookes cathode rays tiny impeller was rotated on the glass sling. In 1895, Wilhelm Roentgen discovered X-rays, called further X-rays. The following year, Henri Becquerel found that uranium salt spontaneously emits invisible radiation, like x-rays; phenomenon is called radioactivity. For their study X-rays and Becquerel were awarded the Nobel Prize
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