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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An element consists of two isotopes 69X and 71X, whose abundances are 60% and 40% respectively. What is the relative atomic mass of element X?
69.2
69.8
70.0
70.2
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Iron has many different naturally occurring isotopes.
Isotope | % Abundance | Isotopic mass |
|---|---|---|
54Fe | 5.845 | 53.9396 |
56Fe | 91.754 | 55.9349 |
57Fe | 2.119 | 56.9354 |
58Fe | 0.282 | 57.9333 |
What is the average atomic mass of iron?
56.1858 amu
54.200 amu
59.270 amu
55.845 amu
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m / z value | 84 | 86 | 87 | 88 |
|---|---|---|---|---|
% abundance | 0.56 | To be found | To be found | 82.58 |
A sample of strontium was analysed by mass spectroscopy. Some of the relative abundances of each isotope are shown in the table
Strontium has a relative atomic mass of 87.71.
What percentage abundance values below are correct for strontium-86 and strontium-87 respectively?
6.86% and 9.86%
9.90% and 6.96%
7.00% and 9.54%
8.67% and 8.19%
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The mass spectrum of a sample of element X is shown above.
There are four peaks at m / z = 12, 24, 25 and 26.
Which of the following statements is / are correct?
The peak at m / z = 12 is due to a 24X2+ ion.
The peak at m / z = 12 is due to an ion with a total of 12 neutrons and protons.
The relative atomic mass of element X will be between 12 and 24.
1, 2 and 3
Only 1 and 2
Only 2 and 3
Only 1
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