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Chemistry

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In an alternate dimension, Promethium (Pm; Z = 61) is stable. It has 3 stable isotopes
145pm (144.96 amu; 68.47%), 146Pm (145.98 amu; 21.39%), and 147Pm (146.99
amu; 10.14%). What is the average atomic mass of Promethium in this alternate
universe?

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