1. What is an isotope?
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2. What does the number next to the isotope signify?
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3. How can if an isotope belong to the same element?
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4. Here are three isotopes C-12, C-13, C-14
6
C
12
a. The element is: _______________________
b. The number 6 refers to the _____________
c. The numbers 12, 13, and 14 refers to the __________________
d. How many particles are in each isotope?
C-12
Protons = ________
Neutrons = ________
C-13
Protons = ________
Neutrons = ________
C-14
Protons = ________
Neutrons = ________
5. Complete the following chart:
Isotope Name
Potassium-37
Oxygen-17
Uranium-235
Uranium-238
Boron-10
Boron-11
Chromium-58
Chromium-63
Carbon-12
Carbon-16
Nitrogen-15
Nitrogen-20
Sulfur-23
Sulfur-25
Sodium-12
Sodium-20
Selenium-50
Atomic #
Mass #
# of Protons
# of Neutrons
# of Electrons
Selenium-55
Manganese-42
Manganese-40
Germanium-62
Germanium-64
Palladium-94
Palladium-97
Cesium-167
Cesium-166
6. Complete the chart using the information provided.
Symbol
Element
Atomic #
#p+
#no
8
9
77
207
Pb
82
11
12
#e-
54
Mass#
38
50
14
238
U
92
10
Answer Key