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September 16, 2014

September 16, 2014

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

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 4:51pmPersonally, 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 4:54pmThe 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 4:57pmThe 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

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