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chemical element
Species of atoms having the same number of protons in the atomic nucleus and the same chemical properties, but not necessarily the same mass, or the same stability
A chemical element is a chemical substance that cannot be broken down into other substances by chemical reactions. The basic particle that constitutes a chemical element is the atom. Elements are identified by the number of protons in their nucleus, known as the element's atomic number. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus. Atoms of t... Wikipedia
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