An atom of an element has 11 protons, 11 electrons, and 12 neutrons. The atomic mass of the atom is:

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Solution

The correct option is A 23
The atomic mass of an atom is the sum of protons and neutrons in an atom.
Atomic mass = No.of protons + No. of Neutrons
$= 11 + 12$
$= 23$
Hence, the correct option is $(A)$

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