In the 1890's scientist found that invisible rays are emitted when matter is hit with a jolt of electricity. Such experiments involved transmitting electric arcs between two ends of cathode ray tubes. Some physicists discovered some substances that spontaneously emitted invisible rays regardless of electricity or any other type of energy. An example of these substances are: uranium and radium, which are named radioactive materials. X-rays were a portion of the emitted rays that had …showed first 75 words of 443 total…

…showed last 75 words of 443 total…removal electrons. The addition of electrons would result in a negative charge, and deficiency in electrons would result in a positive charge. This theory of the motion of electrons is still in effect nowadays for chemistry, explaining chemical reactions. The fault in JJ's model lay in placement of the electrons. His model presented a rough idea of an atom for scientists, but failed to explain various experiment. This resulted in his model rapidly becoming obsolete.