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Aristotle believed that all matter was up of four elements: fire, air, earth and water.
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If matter were to be divided into smaller and smaller pieces, it would eventually lead to the smallest piece possible in which Democritus reffed to as the atomos.
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Contribution of particular scientists to the atomic theory.
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Helped develop a definition for the atmoic theory and helped with the 'death' of the four elements: fire, air, water, earth.
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Atoms were pulled together by strong forces and attractions.
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Discovery of the gas named oxygen.
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Created the principle the law of conservation of mass.
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Proposed a number of basic ideas revolving the atom as well as devising several element symbols.
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Created the perodic table.
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Number of protons in an element determines its atomic number.
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Discovered the atomic nucleus.
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Inside the nuclues contains neutral particles called neutrons as well as positvely charged particles called electrons.
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Proposed a model of an atom which stated that the outer shell could hold more electrons than the inner shell.
