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

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Solution

Atomic number= Number of protons present in the nucleus= Number of electrons present in a neutral atom
As the given atomic number is 11, it indicates the number of protons present in Sodium (Na)
Mass number= Number of protons+ Number of neutrons
As the given mass number is 23, it indicates the total number of nucleons (i.e.; protons and neutrons).

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