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Phosphorus has an atomic mass of 31 and an atomic number of 15, so the number of neutrons must be _______________.
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Phosphorus has an atomic mass of 31 and an atomic number of 15, so the number of neutrons must be _______________.

User Aliaxander
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sorry i'm late:

16 (how to get answer is shown below on second photo):

Phosphorus has an atomic mass of 31 and an atomic number of 15, so the number of neutrons-example-1
Phosphorus has an atomic mass of 31 and an atomic number of 15, so the number of neutrons-example-2
User Yulanda
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Remember this:

atomic mass= atomic number + number of neutrons

The atomic number (same thing as number of protons) in this case is 15. The atomic mass is 31.

So, we subtract 15 from 31 to find the number of neutrons.

31-15=16

16 neutrons!!!
User Stephen Denne
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