| NOUN | cognition | Rutherford atom | first modern concept of atomic structure |
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| Meaning | First modern concept of atomic structure; all of the positive charge and most of the mass of the atom are contained in a compact nucleus; a number of electrons (equal to the atomic number) occupy the rest of the volume of the atom and neutralize the positive charge. | |
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| Broader | atomic theory | A theory of the structure of the atom |
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