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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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How many neutrons does element X have if its atomic number is 31 and its mass number is 90?

User Arnaud Bertrand
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1 Answer

1 vote
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
User Ankur Bhutani
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