Saturday
December 20, 2014

Homework Help: Chemistry

Posted by Jean on Saturday, July 24, 2010 at 2:16pm.

I have a problem that I'm wondering is a "trick" question.

How many nucleons are there in an atom of 235 (atomic mass) over 92 (atomic #) U? According to the periodic table, the atomic mass is 238, not 235. Any comments? Thanks a lot!

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