Matter and Atomic Structure
Practice Test
1.
The number of protons in an atom's nucleus is the __________.
SC.A.2.4.1
a.
mass number
b.
atomic number
c.
isotopic number
d.
radioactivity number
2.
What particles make up the nucleus of an atom?
a.
protons and neutrons
b.
electrons only
c.
neutrons and electrons
d.
protons only
3.
When a gas cools, it __________ thermal energy in the process of __________.
SC.A.1.4.4
a.
releases, evaporation
b.
gains, condensation
c.
gains, sublimation
d.
releases, condensation
4.
What process is labeled C in the figure?
SC.A.1.4.3
a.
melting
b.
condensation
c.
evaporation
d.
sublimation
5.
The attraction of two atoms for a shared pair of electrons that hold the atoms together is called __________.
SC.A.1.4.5
a.
a compound
b.
a chemical reaction
c.
a covalent bond
d.
an ionic bond
6.
What is a solid that has particles arranged in regular geometric patterns?
SC.A.1.4.1
a.
a covalent bond
b.
an iconic compound
c.
a crystalline structure
d.
a gas
7.
Electrons tend to occupy the __________ energy level.
SC.A.1.4.5
a.
highest available
b.
lowest available
c.
intermediate
d.
second
8.
What makes an element stable?
SC.A.1.4..5
a.
if its outermost energy level is full
b.
if it has the same number of neutrons and protons
c.
if it has a covalent bond
d.
if its nucleus is packed tightly
9.
What type of atomic particle has a negative charge?
a.
a proton
b.
a neutron
c.
an electron
d.
an isotope
10.
What is an ion?
SC.A.2.4.1
a.
an isotope
b.
a charged particle
c.
a gas
d.
a molecule
11.
What is the attractive force between two particles of opposite charge called?
SC.A.1.4.5
a.
an isotope
b.
a compound force
c.
a covalent bond
d.
an ionic bond
12.
A __________ is composed of two or more atoms held together by covalent bonds.
SC.A.1.4.5
a.
molecule
b.
covalent bond
c.
ionic bond
d.
a gas
13.
What determines the chemical behavior of an element?
SC.A.1.4.1
a.
the number of energy levels
b.
its isotopes
c.
the valence electrons
d.
the size of the nucleus
14.
What is a gas that is composed of positive ions and free electrons?
SC.A.1.4.3
a.
a liquid
b.
a plasma
c.
neon
d.
hydrogen
