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  • 03-06-2018
  • Physics
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How many neutrons does element X have if its atomic number is 31 and its mass number is 90?

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Porshia
Porshia Porshia
  • 03-06-2018
Things you need to know:
Atomic number= protons,
Protons + neutrons= mass number.
This means 31 + x = 90
Subtract 31 from both sides and you get x= 59
Answer is 59 neutrons
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