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He slowed the Atomic Theory by disagreeing with Democritus
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He was the first to propose any type of atmomic theory. He believed everything had "atomos."
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Alchemists developed the theory that all metals are composed of mercury and sulfur and that its possible to change base metals into gold.
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He developed the idea that matter had positive and negative charges
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He began the controversy on exactly an atom is
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He proposed the Law of Constant Composition.
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He created Dalton's theory. Some of his theory is still being used in chemistry today.
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He suggested that the structure of the atom relates to electricity
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He was the founder of the Quantum Theory that focuses on the nature of matter
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He came up with the first design of the Periodic Table Of Elements.
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He reconstructed the cathode ray and showed there is a negative charge in atoms
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He discovered radioactivity
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He discovered the electron
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They discovered polonium and radium. Both of those were radioactive elements
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He published the famous equation E=mc^2
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He used the oil drop experiment and determined the charge and mass of an electron
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He came to the conclusion that an atom has a dense and charged nucleus with electrons floating randomly around the nucleus.
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He came to the conclusion that an atom has a dense and charged nucleus with electrons floating randomly around the nucleus.
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He made the bohr model which had electrons around the nucleus. H egave us the understanding of why atoms bond and how they stay the same.
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He said that moving particles in an atom have some properties of waves.
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He founded quantum mechanics that was used to interpretating the behavior of atoms
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He develpoed mathematical equations that describe the motion of an atom which lef to the electron cloud model
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He discovered neutrons
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