Focus On Physical Science: California Grade 8

Chapter 7: The Periodic Table and Physical Properties

Standards Review

1.
The most reactive nonmetals are called _______. 7.a
A)lanthanides
B)actinides
C)halogens
D)noble gases
2.
Which is a group on the periodic table? 3.f
A)a horizontal row of elements
B)a vertical column of elements
C)all elements with the same colored block
D)all elements with the same icon
3.
What type of element is silicon? 7.a
A)semimetal
B)metal
C)nonmetal
D)halogen
4.
A horizontal row of elements is called a ___________. 3.f
A)nonmetal
B)group
C)metal
D)period
5.
What of these occurs during beta decay? 7.b
A)A nucleus emits a neutron.
B)A nucleus emits a proton.
C)A nucleus emits an alpha particle.
D)A nucleus emits an electron.
6.
The most reactive metals are found in which groups? 7.a
A)17 and 18
B)16 and 17
C)3 through 12
D)1 and 2
7.
How does the atomic number of a nucleus change when beta decay occurs? 7.b
A)It increases by two.
B)It decreases by one.
C)It increases by one.
D)It decreases by two.
8.
Which is not a physical change? 5.d
A)boiling
B)burning
C)dissolving
D)freezing
9.
Substances with higher boiling points usually have _______. 7.c
A)stronger attractive forces between atoms or molecules
B)weaker attractive forces between atoms or molecules
C)larger atoms or molecules
D)smaller atoms or molecules
10.
Which is true about the isotopes of an element? 7.b
A)They have the same number of protons in the nucleus.
B)They have the same number of neutrons in the nucleus.
C)The total number of protons and neutrons in the nucleus is the same.
D)They have the same mass number.
11.
How many neutrons does carbon-13 have? 7.b
A)6 neutrons
B)7 neutrons
C)8 neutrons
D)13 neutrons
12.
If the half-life of a radioactive isotope is 1,000 years, how much of a 4-g sample is left after 2,000 years? 7.b
A)0.25 g
B)2 g
C)1 g
D)3 g
13.
The electrical conductivity of metals is high because _______. 7.c
A)metals are solids
B)atoms are close together in metals
C)atoms have more mass in metals
D)metals contain electrons that are free to move
14.
Which substance has the lowest thermal conductivity? 7.c
A)solids
B)liquids
C)gases
D)metals
15.
Which is true about a change in state? 5.d
A)It is irreversible.
B)It is reversible.
C)It is a chemical change.
D)It occurs during radioactive decay.
Grade 8
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