Indiana Science Grade 8

Chapter 3: Inside the Atom

Standardized Test Practice

1.
The table above shows properties of some nitrogen isotopes. How many neutrons does nitrogen-13 have?

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A)7
B)6
C)13
D)14
2.
According to the table, what is the atomic number of Nitrogen-15?

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A)7
B)8
C)14
D)15
3.
Which of the isotopes listed in the table would you expect to be the most stable?

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A)nitrogen-12
B)nitrogen-13
C)nitrogen-15
D)nitrogen-14
4.
What is a beta particle?
A)high-energy proton
B)low-energy electron
C)low-energy proton
D)high-energy electron
5.
Cadmium has an atomic number of 48 and a mass number of 112. How many protons does cadmium have?
A)64
B)96
C)112
D)48
6.
What holds the protons and neutrons together in the nucleus of an atom?
A)electromagnetic force
B)gravitational force
C)weak force
D)strong force
7.
The half-life of tritium is 12.5 years. If you start with 75 g, about how much will be left after 37.5 years?
A)9.4 g
B)4.7 g
C)19 g
D)38 g
8.
Which of the following describes an alpha particle?
A)two protons and two neutrons
B)one proton and one neutron
C)one proton and two neutrons
D)two protons and one neutron
9.
According to the illustration, what is the atomic number of boron?

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A)6
B)10
C)5
D)11
10.
Cobalt-60 has a half-life of 5.27 years. About how long would it take for 263 g of a 350-g sample of cobalt-60 to decay?
A)10.5 years
B)5.27 years
C)7.91 years
D)15.8 years
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