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Aristotle disagreed with Democritus's belief. The belief of atoms was banished.
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Formulated the fundamental gas laws. First to propose the combination of small particles to form molecules. Differentiated between compounds and mixtures.
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Uses aberration of starlight to determine the speed of light to within 5%. accuracy.
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Discovered chlorine, tartaric acid, metal oxidation, and sensitivity of silver compounds to light (photochemistry).
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Demonstrated that lightning is electricity.
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Discovered oxygen, carbon monoxide, and nitrous oxide. Proposed electrical inverse-square law
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Demonstrated the wave nature of light and the principle of interference.
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Invented process for making soda ash from sodium sulfate, limestone and coal.
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Dalton revived the idea of the atom. When the atoms form together, they grow into crystal.
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He explained how different atoms had a fixed proportion. He also found that when atoms break up they are called molecules.
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Becquerel discovered that some metals were radioactive. He discovered it by accident.
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Marie & Pierre Curie discovered Radium. Marie was the first person to win a Nobel Prize for two ideas. They died by radium.
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Thomson, physicist, inferred from his experiments that atoms contained negatively charged particles. He thought these electrons were evenly embedded throughout a positively charged sphere.
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Einstein discovered a new law. His theory showed that every mass had a great amount of energy.
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He figured that the atom is mostly empty space. He showed that radium/radiation can pass through atoms. And every thousand atoms the radiation hits something solid.
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Danish physicist, Niels Bohr, hypothesized that electrons traveled in fix orbits around the atom's nucleus. James Chadwick, a student of Rutherford, concluded that the nucleus contained positive protons and neutral neutrons.
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According to the currently accepted model of atomic structure, electrons do not follow fixed orbits but tend to occur more frequently in certain areas around the nucleus at any given time.
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Discovered nitrogen. Described the composition of many organic compounds. Sometimes regarded as the Father of Chemistry.
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Thought that heat was a form of energy.
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He was the fist person to believe that all things were made of tiny atoms.
