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.

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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