An atom of aluminum has an atomic number of 13 and a mass number of 27. How many neutrons does it have?

Answer 1

14 neutrons

The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus.

With this information it is an easy question: mass number (p + n) - atomic number (p) = neutrons (n) #-> 27 - 13 = 14# neutrons!

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Answer 2

Cameron Andrews

14 neutrons.

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Answer 3

Noah Aldrich

To find the number of neutrons in an atom, subtract the atomic number from the mass number.

Number of neutrons = Mass number - Atomic number

For aluminum: Atomic number = 13 Mass number = 27

Number of neutrons = 27 - 13 = 14

Therefore, an atom of aluminum has 14 neutrons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.