The atomic symbol “Al” tells us:
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Element: The element is Aluminum.
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Atomic Number: Aluminum has an atomic number of 13, meaning it has 13 protons and 13 electrons in a neutral atom.
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Mass Number: The mass number (atomic mass) can be deduced from the isotope being referenced, typically 27 for the most common isotope of aluminum. The mass number gives the total number of protons and neutrons