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An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct regarding number of protons, electrons and neutrons respectively?

An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct regarding number of protons, electrons and neutrons respectively? Correct Answer 11, 11, 12

The atom, Sodium is an uncharged species, hence number of protons and electrons must be equal and that is equal to the atomic number which is 11.

Mass number = Number of protons + Number of neutrons, hence number of neutrons is 12.

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