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William Crookes added to our knowledge of the atom that matter was composed of tiny particles
Actually there are 4 scientists that contributed. The 4 scientists who contributed to current knowledge of the atom are John Dalton, William Crookes, J.J. Thomson, and Ernest Rutherford.
William Crookes concluded from cathode rays that there was something more to an atom. Something that carried an electrical current. This was a mystery at the time. William Crooke's experiment helped pave the way for J.J. Thompson's discovery of the electron.
what did marsden contribute to the evolution of the atom
dalton created a solid sphere model. He belived that the atom was one single sphere, and that diffrent elements were made of diffrent types of atoms.
we were feared of due to the technology of the atom bomb.
442 BC
William Roentgen discovered x rays and Roentgen rays. Charles Darwin's contribution was the theory of evolution. John Dalton's contribution was the atomic theory.
This is the neutron.
The subatomic particles that contribute most almost no weight to an atom are electrons at various energy levels. Isotopes of the same element differ from each other only by the number of neutrons.
he found the measurement or electron charge