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If the atomic number of an element is 6 and its mass number is 20, how many neutrons are in the atom's nucleus?
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If the atomic number of an element is 6 and its mass number is 20, how many neutrons are in the atom's nucleus?

User Andreas Herd
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Remember

Mass number - atomic number = number of neutrons
Remember that mass number is the sum of both protons and neutrons
The atomic number tells us how many protons there are

20 - 6 = 14 neutrons

There are 14 neutrons in the nucleus.
User Brian Dupuis
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