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Naturally occurring copper is a mix of 2 of these variants, Cu63 & Cu65 |
isotopes
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$200 |
J |
THE ELEMENTS |
2019-03-27 |
#7958 |
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Chemist Frederick Soddy came up with this term for atoms having the same nuclear charge but different masses |
isotopes
DD
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$100 |
DJ |
INTERNATIONAL YEAR OF CHEMISTRY |
2011-06-21 |
#6177 |
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(Jimmy reports from the Scripps Institution of Oceanography.) To track global warming, scientists use Antarctic ice cores & measure relative amounts of different forms of elements known as these |
isotopes
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$2,000 |
DJ |
AN ELEMENT-AL CATEGORY |
2009-01-01 |
#5599 |