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The atom in question has 13 protons, so is atomic number 13, which is Aluminium. Assuming that all of the atom's mass is formed from the protons and neutrons, and each of these have Atomic Mass 1, the number of neutrons is 27 - 13 = 14 neutrons. Almost all Aluminium is of this isotope.

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14y ago
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14y ago

Mass number is calculated by adding the number of protons to the number of neutrons.

So if an atom has a mass of 27 and 13 of that mass is made up by protons then the answer is:

27 - 13 = 14

So there are 14 neutrons

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What is an atom's mass number equal to?

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14 27-13

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Q: An atom has 13 protons and an atomic mass of 27 How many neutrons does this atom have?
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