Represent of elements
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A chemical element consists of those atoms with a specific number of protons in the nucleus; this number is called the atomic number. ... Elements are represented by a chemical symbol, with the atomic number and mass number sometimes affixed as indicated below.
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Elements are represented by a chemical symbol, with the atomic number and mass number sometimes affixed as indicated below. The mass number is the sum of the numbers of neutrons and protons in the nucleus.
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