Glencoe Science Level Blue

Chapter 14: 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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