Question:

How many neutrons are in the radioisotope Pa-234?

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A. 91

B. 143

C. 234

D. 325

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  1. The atomic number of an element is the same as the number of protons present in that element. Therefore, 234 (the atomic wt) - 91 (the atomic number) = 143 (the number of neutrons.

    the answer is 'B'...


  2. Subtract 91 from 234 for your answer.
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