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Answer:
Atomic mass is the amount of protons and neutrons in an atom. Electrons aren't included in atomic mass, so we can forget about the electrons in this question.
Explanation:
Facts:
-- The 13 protons are a part of the atomic mass of 27, so we have to take away 13 from 27. --
27 - 13 = ?
27 - 13 = 14
There are 14 neutrons in the atomic mass. Remember that atomic mass consists of only protons and neutrons, so your answer must be 14 neutrons.
I hope this helps!
