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The atomic number of an atom represents the number of protons in its nucleus. In a neutral atom, the atomic number also corresponds to the number of electrons orbiting the nucleus.

Given that the atom in question has a mass number of 25 and 12 neutrons, we can determine the atomic number as follows:

Mass number (A) = Number of protons (atomic number, Z) + Number of neutrons

Therefore, in this case:

25 = Z + 12

Solving for Z, we subtract 12 from both sides:

Z = 25 - 12 Z = 13

Hence, the atomic number of the atom is 13.

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