Chemical element
A chemical element is a species of atom defined by its number of protons. The number of protons is called the atomic number of that element.
A chemical element is a species of atom defined by its number of protons. The number of protons is called the atomic number of that element.
A chemical element is a species of atom defined by its number of protons. The number of protons is called the atomic number of that element.
Source: Wikipedia "Chemical element" · CC BY-SA 4.0
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