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Beginning of Paper
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Atomic Structure
The concept of the atom has existed since the 5th century BC, but it was not until the beginning of the 19th century that this concept was developed into a scientific theory. Almost as soon as the modern atomic theory was established, it was discovered that atoms were not the basic ....
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Middle of Paper
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.... The Russian chemist Dmitri Mendeleev argued that there was a set of more basic entities of which all molecules are constructed, the chemical elements, which consist of atoms of only one kind. In about 1869 he published his periodic table, which exhibited many regularities and sets of recurring properties among these elements.
Even while the existence of atoms was being established, new experimental evidence showed that there would be another stage of matter because atoms were not pointlike objects. One clue was the discovery of the electron i ....
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SUBJECTS
