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Unit 2: Atoms and Elements
AP Chemistry
Isotopes Problem Set
21.
Give the mass number of each of the following atoms:
(a) an iron atom with 30 neutrons
56
(b) an americium atom with 148 neutrons
243
(c) a tungsten atom with 110 neutrons
184
23.
Give the complete symbol ( AZ X ) for each of the following atoms:
15
(a) nitrogen with 8 neutrons
7N
64
(b) zinc with 34 neutrons
30Zn
129
(c) xenon with 75 neutrons
54Xe
25.
How many electrons, protons, and neutrons are there in an atom of:
(a) carbon-13, 13 C
p+ = 6 n0 = 7 e- = 6
27.
(b) copper-63, 63 Cu
p+ = 29
n0 = 34
(c) bismuth-205, 205 Bi
p+ = 83
n0 = 122
31.
33.
e- = 83
Fill in the blanks in the table (one column per element).
65
86
Symbol
Cu
Kr
Number of protons
Number of neutrons
Number of electrons
in the neutral atom
Name of element
29.
e- = 29
195
78Pt
82
36Kr
29
36
36
50
78
117
36
46
29
36
78
36
Copper
Krypton
Platinum
Krypton
Radioactive americium-241 is used in household smoke detectors and in bone mineral analysis. Give the
number of electrons, protons, and neutrons in an atom of americium-241.
p+ = 95 n0 = 146 e- = 95
Which of the following are isotopes of element X, with atomic number of 9: 199 X , 209 X , 189 X , and 219 X .
Verify that the atomic mass of magnesium is 24.31 amu, given the following information:
24
Mg , mass = 23.985042 amu; percent abundance = 78.99%
25
Mg , mass = 24.985837 amu; percent abundance = 10.00%
26
Mg , mass = 25.982593 amu; percent abundance = 11.01%
35.
Copper has two stable isotopes, 63 Cu and 65 Cu , with masses of 62.939598 amu and 64.927793 amu,
respectively. Calculate the percent abundances of these isotopes of copper.
63
65
Cu = 69.50%
Cu = 30.50 %
37.
Strontium has four stable isotopes, Strontium-84 has a very low natural abundance, but
88
86
Sr are all reasonably abundant. Which of these more abundant isotopes predominates?
Sr , 87 Sr , and
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