WorksheetsParts of an Atom and Average Mass
Total questions: 8
Worksheet time: 16mins
The element copper has naturally occurring isotopes the first is 62.93amu at 69.2% abundance and the second is 64.93amu at 30.8% abundance. What is the average atomic mass of copper?
63.55 amu
63.54 amu
63 amu
64 amu
Calculate the average atomic mass of sulfur if 95.00% of all sulfur atoms have a mass of 31.972 amu, 0.76% have a mass of 32.971 amu and 4.22% have a mass of 33.967 amu.
32.05 amu
32.06 amu
33 amu
34 amu
Naturally occurring isotopes of strontium are: 0.56% are Sr-84, 9.86% are Sr-86, 7.00% are Sr-87 and 82.58% are Sr-88. What is the average atomic mass?
87.71 amu
87 amu
84
86
Potassium is an alkali metal that is one of the electrolytes needed by the human body to conduct nerve impulses. The majority of potassium (93.26%) occurs as potassium-39. The rest is either potassium-40 (0.01%) or potassium-41 (6.73%).
39.13 amu
40 amu
38 amu
93.31 amu
Zirconium is an element that makes up the cubic zirconia crystal that is commonly used as a cheap replacement for diamond. Zirconium has the following naturally occurring isotopes:
91.21 amu
92 amu
19.21amu
93 amu
Calcium is a metal that is part of bone. It has several naturally-occurring isotopes. Calculate the average atomic mass.
40.07 amu
40.08 amu
40 amu
41 amu
Tungsten is a metal found in the inner filaments of incandescent light bulbs. It has five naturally- occurring isotopes. Calculate the average atomic mass.
183.84 amu
183 amu
183.9 amu
183.85 amu
There is more hydrogen present in the universe than any other element. 99.99% of all hydrogen is the hydrogen-1 isotope. The other 0.01% is hydrogen-2, also called deuterium.
1.0078 amu
1.0001 amu
1.0199 amu
2 amu
