Chapter 2: Atoms, Ions, and the Periodic Table
2. Two isotopes are known for Element Y. 35.0% of all the atoms of Element Y have an atomic mass of . amu. 65.0% of the isotopes have an atomic mass of 32.0amu. Find the average atomic mass of Element Y. 29.7 (0.35) + 32.0 (0.65) = 31.195amu. 3. Element Z has three isotopes. The atomic mass and abundance of each is given below. ................
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