3 years ago

How many neutrons does element X have if its atomic number is 39 and its mass number is 94?

1 answer:

8 0

The sum of neutrons would be 55. (: I hope this helps. because if you minus the mass number by the atomic number which is always equivalent to the number of protons, you get the amount of neutrons. The amount of protons and neutrons always add up to the mass number.

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