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Question Question 12
The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?
Atomic number of sodium is 11 means the number of protons present in the nucleus of sodium atom is 11 and the number of electrons present is 11. Mass number of sodium is 23 means the number of protons + number of neutrons is 23. So number of neutrons present is 12.