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Democritus said that all things are made of atoms.
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John Dalton proposed an "atomic theory"with sqherical solid atoms based on measurable properties of mass.
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Hertz discovered radio waves
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J.J Thompson discovered the eloctron. He created an atom model as a sphere of positive matter in which electrons are positive by electronic forces.
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Rutherford discovered alpha and beta rays. He also identified alpha particles as helium nuclei. He also assumed that the electrons were outside the nucleus of the atom.
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Bohr created a picture of an atomic structure. This model depicted both neutrons and protons in the nucleus. It also showed electrons in an electron cloud outside the nucleus.
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James Chadwick discovered the neutron.
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Cockroff and Walden discovered that the atom can be split.
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In 1945 an atomic bomb was dropped on Japan ending World War 2.
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Neils Bohr developed the theory of nuclear fission. Because of these discoveries. we have power plants today.
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Hertz discoveries allowed advances in technology such as television, radio, and many other things.
