Section #: 3.2
How Atoms Combine
Practice Test
1.
What makes an element stable?
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a.
if it has a covalent bond
b.
if it has the same number of neutrons and protons
c.
if its outermost energy level is full
d.
if its nucleus is packed tightly
Hint
2.
A __________ is composed of two or more atoms held together by covalent bonds.
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a.
covalent bond
b.
molecule
c.
ionic bond
d.
a gas
Hint
3.
What is the attractive force between two particles of opposite charge called?
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a.
an ionic bond
b.
a covalent bond
c.
an isotope
d.
a compound force
4.
Why does a water molecule have a bent shape?
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a.
it's a compound
b.
it has ionic bonds
c.
it's a polar molecule
d.
because it occurs on Earth as a solid, liquid, and a gas
Hint
5.
What is an ion?
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a.
a molecule
b.
an isotope
c.
a gas
d.
a charged particle
Hint
6.
An Mg +2 particle has __________ electrons.
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a.
gained one
b.
lost four
c.
gained two
d.
lost two
Hint
7.
The attraction of two atoms for a shared pair of electrons that hold the atoms together is called __________.
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a.
a chemical reaction
b.
an ionic bond
c.
a covalent bond
d.
a compound
Hint
8.
Bases produce __________ in solution.
a.
oxygen ions
b.
hydroxide ions
c.
hydrogen ions
d.
helium ions
Hint
