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The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.

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The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.

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Atomic number = 11; No of protons = 11

Mass number = 23 = Number of protons + Number of neutrons.

No of neutrons = 23-11 = 12.

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