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aristotle beleived that the world was made up of 4 elements: earth, air, water, and fire.
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democritus was the first philosopher to come up with the theory that everything is made up of tinier items that are invisable and indestrucable
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when the idea was almost lost, Galileo did an experiments of falling objects brought it back to life
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robert boyle proved that the 4 element theory, when he proved that an element are substances that can't be divided into smaller parts.
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came up with the first person to come up with the first atomic theory
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he showed told the differences between a atom and a molecule.
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he came up with the idea that atoms were the world's building blocks.
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discovered protons within the nucleus of the atoms
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he orginized the elements into the periodic system
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he discovered electrons
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discovered neutrons within the nucleus
