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What is an atomic number?
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What is an atomic number?

User Alfacan
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The number of protons in the nucleus of an atom which determines the chemical properties of an element and where it is placed in the periodic table
User Faegy
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an atomic number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table or chart.
User Leonel
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