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The atomic number of an atom is the number of ______.

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The atomic number of an atom is the number of ______. Protons

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User Matt Innes
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The atomic number is equal to the number of protons in an atom's nucleus. The atomic number determines which element an atom is. For example, any atom that contains exactly 47 protons in its nucleus is an atom of silver.
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User Simpatico
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