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How do you find the mass number when given the neutrons?

illsternog

wrote...

Posts: 63

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11 years ago

How do you find the mass number when given the neutrons?

This is the question: How do you find the mass number of a uranium atom that contains 143 neutrons?

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buffalo

wrote...

#1

11 years ago

Add the mass of the 143 neutrons to the mass of the protons (# of protons = atomic #)

tonesack

wrote...

#2

11 years ago

Add the number of neutrons (143 in this case) to the atomic number of the element (uranium's is 92).

92 + 143 = 235 (and that is the mass number of that particular isotope of uranium)

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