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The number of protons in an atom will always be the same as the atomic number, by which the Periodic Table is organized. So figuring out how many protons an atom has just becomes an exercise at reading the table. In this case, aluminum has an atomic number of 13. If the particle is specifically an atom, then it will be neutral and the number of electrons will balance the number of protons exactly. The number of neutrons will differ depending on the isotope - atoms of the same element with different numbers of neutrons. Although, almost 100% of aluminum is 27Al with 14 neutrons.

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