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2007-06-21 11:25:19 · 2 answers · asked by Anonymous in Science & Mathematics Chemistry

2 answers

It is simply the relative % of each isotope in the natural environment.

The atomic mass for each element on the periodic table is actually the average based on the abundance of each isotope.

2007-06-21 12:10:40 · answer #1 · answered by reb1240 7 · 0 0

You look it up.

http://www.sisweb.com/referenc/source/exactmas.htm

2007-06-21 20:06:04 · answer #2 · answered by Uncle Al 5 · 0 0

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