Final answer:
An atom of aluminum (Al) with an atomic number of 13 and a mass number of 27 has 14 neutrons.
Step-by-step explanation:
An atom of aluminum (Al) has an atomic number of 13 and a mass number of 27. The atomic number represents the number of protons in an atom's nucleus, while the mass number represents the total number of protons and neutrons. To find the number of neutrons, subtract the atomic number from the mass number: 27 - 13 = 14 neutrons.
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