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Chemistry
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18 Nov 2019

. The average atomic mass of Eu is 151.96 amu. There are only two naturally occurring isotopes of europium, 151Eu with a mass of 151.0 amu and 153Eu with a mass of 153.0 amu. The natural abundance of the 131Eu isotope must be approximately a. 60%. b. 20%. c. 50%. d. 80%. e. 40%.

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11 Nov 2019
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