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September 5, 2015

Homework Help: Chemistry

Posted by Anonymous on Tuesday, May 26, 2009 at 4:38pm.

Which element has no stable isotopes?
1. (subscript)27 Co
2. (subscript)51 Sb
3. (subscript)90 Th
4. (subscript)82 Pb

I believe it's either 2 or 3, but I can't decide which. I'm not sure how to go about answering this question, how can you tell which have stable isotopes and which don't?

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