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He defines how small particles can affect each other across a distance by the act of forces, also helping in the understanding of co-valent and ionic compounds.
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We now know that elements are made of tiny particles called atoms, atoms cannot be created or divided, atoms in a given element are identical and atoms in different elements can be distinguished by their relative atomic weight.
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He proposed the term “electron”, to describe the essential unit of electrical charge. This laid foundation for the discovery of the particle later on.
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He discovered through his studies that atoms were in fact made up of other things (protons and electrons). Secondly, he determined the charge to mass ratio of an electron (=1.759 x 10 8 coulombs/gram).
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He deduced the relationship between energy and the frequency of radiation and had the idea that the energy emitted by a resonator could only take on discrete values or quanta.
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He provided the knowledge that electrons revolve around the atom in rings, bound by electrostatic forces.
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He provided the knowledge of the charge on an electron and that this charge is constant for all electrons, thus demonstrating the atomic structure of electricity.
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He concluded that the nucleus was very small, very dense and assumed that electrons were outside of it. He is also credited with discovering the proton.
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He wrote that the atomic number of an element is equal to the number of protons in a nucleus. This information was used to reorganize the periodic table according to atomic number instead of atomic mass.
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He proposed that each electron shell going out would have more electrons than the previous ones and that the outer shells determine the atom’s chemical properties.
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Chadwick discovered a third part of the atom, which added weight to an atom but not charge. Hence, the neutron was discovered.