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Democritus and his mentor, Leucippus came up with the atomic theory. He hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible
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came up with a spherical model,determines that atoms of a given element are identical in size, mass, and chemical properties
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AKA plum pudding model,he discovered that atoms are made of positive cores and negatively charged particles within it and it can be divided
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known for his gold foil experiment, determined the nucleus from J.J Thomson's pudding
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discovered that electrons orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element.
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proved the existence of neutrons, fundamental for nuclear weapons.
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He believes that all materials on Earth were made up of four elements; earth,air, fire, and water in small amounts. Most people believed in his idea, causing Democritus' idea to be overlooked for about 2,000 years.
