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The theory of Democritus and Leucippus says that everything is made from “atoms”. Also that “atoms” are indestructible and will always be in motion.
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Had his own theory "Daltons theory ." Had 5 main points about how atoms were arranged.
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Studied the characteristics and atomic compound of cathode rays.
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He discovered the electron which he called the corpuscles.
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Dmitri Mendeleev is the scientist that that contributed most to the periodic table and its arrangements.
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Rutherford studied the radioactivity of an atom. He discovered that there are two types of atoms.
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Niels Bohr proposed that electrons traveled in discrete orbit around the nucleus according to the element.
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He proved the existence of neutrons.
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John Newlands studied the periodic table of elements. Came up with the law of octaves.
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He believed that matter consisted of four elements. The elements of the earth: Earth, air, water, and fire.
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