Worksheetsave atomic mass
Total questions: 26
Worksheet time: 22mins
The atomic mass of an element is the ___.
average of the mass number and the atomic number for the element
weighted average of the masses of the isotopes of the element
total mass of the isotopes of the element
total number of subatomic particles in the nucleus
The atomic mass of an element depends upon the ___.
relative abundance of protons in that element
mass and relative abundance of each isotope of that element
mass of each isotope of that element
mass of each electron in that element
Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
Cl-35
Cl-37
Cannot be determined from the information provided.
An element has three isotopes. Given the abundances and relative masses, calculate the average atomic mass and determine (from the periodic table) which element it is.
Abundances | Relative masses
0.005% | 234.04 amu
0.720% | 235.04 amu
99.275% | 238.05 amu
Uranium (#92, Atomic Mass: 238.03 amu)
Fluorine (#9, Atomic Mass: 19.00 amu)
Mercury (#89, Atomic Mass: 200.59 amu)
Polonium (#84 209 amu)
Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118 amu) and 87Rb (relative mass 86.9092 amu). The abundance of 87Rb is 27.8%, If rubidium has an average atomic mass of 85.47 amu, what is the % abundance of 85Rb (in percent)?
27.9%
72.1%
74.63%
34.29%
Element Z has 2 natural isotopes. One isotope has a mass of 15.0 amu and a relative abundance of 30%. The other isotope has a mass of 16.0 amu and a relative abundance of 70%. Estimate the average atomic mass for this one element.
15.0 amu
16.0 amu
15.7 amu
16.9 amu
Calculate the average atomic mass of silver.
106.38649amu
111.91896amu
107.8677amu
121
Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium?
85.468 amu
37 amu
85.6 amu
86.4 amu
Calculate the average atomic mass from the mass spec.
85.56 amu
85.75 amu
86.44 amu
86.74
What element has the following mass spec data?
Sulfur
Nitrogen
Oxygen
Carbon
What element has the following mass spec data?
Thulium
Copper
Europium
Zinc
How many isotopes are shown in this mass spec?
1
2
6
7
Based on the mass spec data, which Iron isotope is the most abundant?
Fe-54
Fe-56
Fe-57
Fe-58
What element has the following mass spec data?
Tin
Tellurium
Chromium
Polonium
Use the mass spectrograph to calculate the weighted atomic mass of this sample.
107
107.89
109
109.97
How many neutrons does an Oxygen-19 isotope have?
19
8
11
10
How may electrons are in 3416S-2?
18
16
14
34
How many protons does Phosphorus-30 have?
What is the Nuclear Symbol for Uranium-238?
23590Th
23890Th
23592U
23892U
How may protons are in 3416S-2?
18
34
16
19
