Chemistry

19 August, 23:32

A newly discovered element, Y, has two naturally occurring isotopes. 90.3 percent of the sample is an isotope with a mass of 267.8 u, and 9.7 percent of the sample is an isotope with a mass of 270.9 u. What is the weighted average atomic mass for this element? 269.4 u 268.1 u 269.0 u 270.6 u

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