The mass spectrum of element X is shown above? Which of the following is true?
Element X is germanium.
X has a relative atomic mass between 71 and 72.
The most abundant isotope of X contains a total of 71 protons and neutrons.
The spectrum shows the abundance of the isotope 72X is greater than the abundance of the 70X.
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Element Z has three isotopes: 70Z, 72Z and 74Z. They occur naturally with abundances of 24.4%, 32.4% and 43.2%, respectively. What is the average atomic mass of element Z?
72.38 amu
72.00 amu
72.22 amu
72.16 amu
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A sample of neon contains the isotopes 20Ne and 21Ne. The average atomic mass of the neon sample is 20.2. What is the percentage of 21Ne atoms in the sample of neon?
8.0%
20%
80%
92%
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