The nucleus of an atom of an element contains 11 protons and 12 neutrons. Determine the atomic number and mass number of the element.
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The nucleus of an atom of an element contains 11 protons and 12 neutrons. Determine the atomic number and mass number of the element. 

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Solution :

Atomic number = number of protons = 11.

Mass number = number of protons + number of neutrons = 11 + 12 = 23.

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