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How many isotopes are there?
We don't know, we haven't discovered them all. If you include unstable ones, there are several hundred.
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How many stable isotopes does oxygen have?
99,321,430,143,143,2103,914
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How many isotopes dose c have?
3 - c12, c13 and c14
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How many isotopes does radium have?
Radium has today 33 isotopes and 12 nuclear isomers.
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How many isotope do copper have?
If you are talking about stable isotopes then there are two, 63Cu and 65Cu.