supergirl13
supergirl13
24-09-2016
Chemistry
contestada
what is the mass number of Ce
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Anslee
Anslee
24-09-2016
140.116 u ± 0.001 u is the answer
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josiah168
josiah168
24-09-2016
The answer is 140.116 u +/- (plus or minus doesnt matter) 0.001
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