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How many neutrons does element X have if its atomic number is 26 and its mass number is 80?
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How many neutrons does element X have if its atomic number is 26 and its mass number is 80?

User Mdmb
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The mass number is the atomic number + number of neutrons.

So, the number of neutrons is 80 - 26 = 54.
User Andrew Kalashnikov
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