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Discovered in 460 BC. Everything is made up of individual particles called atoms, and atoms can't be created, destroyed, or divided.
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All matter is made up of atoms, and tiny particles that are industructable and cannot be divided. The atoms of the same element were exactly alike, and atoms of a specific element are different from those of another element. Atoms combine in simple whole number ratios, and atoms are seperated, combined, or rearranged in chemical reactions.
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He discovered elements by demonstrating cathode rays that were negatively charged. Thomson realized that the accepted model of an atoms were filled with positive or negative cherged particles
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Discovered the nucleus, and he concluded that atoms consisted of a positively charged nucleus, and was surrounded by negative electrons, and has empty space.
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Bohr discovered that electrons orbits the nucleus, and as they change orbit they move up or down and release energy.
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His theory states that hydrogen's atoms electrons move in a wave, the equation describes the likely hood of finding an electron in a certain postition. Where the electron cloud is most dense the probability of finding an electron is greater, vice versa.
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Chadwick found that the composition of atoms also contained neutrons (which are located in the center of atoms, and weigh the same as protons)
