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democritus proposed the idea of the existance of atoms, he thought that diferent substances were made of atoms that had different characteristics
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Five main points of Dalton's atomic theory are
1.Elements are made of extremely small particles called atoms.
2.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3.Atoms cannot be subdivided, created, or destroyed.
4.Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5.In chemical reactions, atoms are combined, separated, or rearranged -
thompson theorized that atoms were made of negatively charged electrons, or "plums", surrounded by a positivly charged "pudding"
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hanatro proposes the existance ofan atoms nucules
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rutherford experiments and states that atoms have a positivly charged nucleus with negetivly charged electrons moving randomly around it
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bohr proposes that the electrons move around the nucleus in an orbit at fixed distances from the nucleus
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these two help to form the electron cloud model where the nucleus has protons and neutrons and has a cloud surrounding it wher you are likely to find electrons, the denser the cloud, the more likely you are to find an electron
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chadwick confirms the existence of neutrons, and that nuclei contain them
