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What is atomic number?

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Atomic number is the number of protons in an element.
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Atomic number is the number of proton in a nucleus of an atom
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Is the number of protons in a nucleus of an atom
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Is the number of protons in a nucleus of an atom
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The number of protons in an atom
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It Is the number of protons in the nucleus of an atom
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The number of  protons in an atom of  an element

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