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?

Chemistry  DrBob222, Tuesday, May 26, 2009 at 4:51pm
Personally, I think this is a very poor question; however, here is a chart.
http://en.wikipedia.org/wiki/Isotope_table_(divided)

Chemistry  PC, Tuesday, May 26, 2009 at 4:54pm
The elements mentioned on the list have 0,1,2 and 4 stable isotopes, but NOT in order.
You only have to browse through articles on stable isotopes to find out which one you need. For example, Google "stable isotope", the Wiki article provides a complete list.

Chemistry  PC, Tuesday, May 26, 2009 at 4:57pm
The answer will also explain why we don't see compounds of that element in the chemistry lab. Unstable isotopes are radioactive!

Chemistry  DrBob222, Tuesday, May 26, 2009 at 4:58pm
http://en.wikipedia.org/wiki/Stable_isotope
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