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sodium atoms contain 11 protons and 11 electrons with a mass of approximately 23. the atomic number of sodium is therefore:
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sodium atoms contain 11 protons and 11 electrons with a mass of approximately 23. the atomic number of sodium is therefore:

User Gregory Conrad
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The atomic number of any element is the number of protons. Therefore the atomic number of sodium is 11.
User Shahyad Sharghi
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