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How many neutrons does element X have if its atomic number is 31 and its mass number is 84?
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3 votes
How many neutrons does element X have if its atomic number is 31 and its mass number is 84?

User Josias Iquabius
by
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1 Answer

5 votes
Atomic number is protons + electrons
Mass number is protons + neutrons
So to calculate the number of neutrons, you do
atomic number - atomic mass
31 - 84 = - 53
User HII
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