Section #: 3.1
What are elements?
Practice Test
1.
According to the symbols shown in the figure, in which state of matter do these elements occur?
a.
solid
b.
liquid
c.
gas
d.
plasma
Hint
2.
What particle(s) make up the nucleus of an atom?
a.
electrons only
b.
protons only
c.
protons and neutrons
d.
neutrons and electrons
Hint
3.
The number of protons in an atom's nucleus is the __________.
a.
isotopic number
b.
radioactivity number
c.
mass number
d.
atomic number
Hint
4.
Isotopes have the same number of __________ but different numbers of __________.
a.
protons, neutrons
b.
electrons, protons
c.
neutrons, protons
d.
neutrons, electrons
Hint
5.
What is the smallest particle of an element?
a.
a proton
b.
an atom
c.
an isotope
d.
a neutron
Hint
6.
Electrons tend to occupy the __________ energy level.
a.
intermediate
b.
second
c.
lowest available
d.
highest available
Hint
7.
What is a substance that cannot be broken down into simpler substances with all the characteristics of the substance?
a.
an element
b.
a gas
c.
matter
d.
a solid
Hint
8.
What do the nuclei of some isotopes release during radioactive decay?
a.
valence electrons
b.
lead
c.
radiation
d.
their nuclei
Hint
9.
What type of atomic particle has a negative charge?
a.
an isotope
b.
a proton
c.
a neutron
d.
an electron
Hint
10.
What determines the chemical behavior of an element?
a.
the size of the nucleus
b.
the number of energy levels
c.
its isotopes
d.
the valence electrons
Hint
