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Biology, 10.02.2021 20:00 corianrigby97

I tried to submit a picture of it but it wouldn't get the whole questions but the question was naturally occurring europium consists of two isotopes with the mass of 151 and 153. europium-151 has an abundance of 48.03% and europium-153 has an abundance of 52.97%. what is the atomic mass of europium?

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