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element, chemical

A substance that cannot decomposed into more elementary constitutent substances by the methods of chemistry. From the point of view of physics, there corresponds to every chemical element a species of atom which can be defined uniquely by the number of protons in its atomic nuclei (for example: nuclei with a single proton define the element hydrogen, two protons define helium, three Lithium, 26 iron and 92 uranium).


  • chemical element