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Aleks [24]
3 years ago
6

How many neutrons does element x have if its atomic number is 39 and its mass number is 84?

Biology
2 answers:
Charra [1.4K]3 years ago
6 0

Yttrium is the answer


Artyom0805 [142]3 years ago
6 0
There are 45 neutrons
try subtracting the atomic number by the mass number.
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