The most common isotope of aluminum is aluminum-27 (written as \(^{27}\text{Al}\)). To find the number of neutrons in this isotope, you can use the following formula:
\[ \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \]
In this case, the atomic number of aluminum (Al) is 13 (the number at the top), and the mass number of the most common isotope (aluminum-27) is 27.
\[ \text{Number of neutrons} = 27 - 13 = 14 \]
Therefore, the most common isotope of aluminum has 14 neutrons.
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