Name
Date
Class
Overview
Chemical Bonds
Directions: All of the statements below are false as written. In the space provided, write a term or phrase that
makes the statement true when it is substituted for the underlined words.
1. The properties of a compound are the same as the properties
of the elements that it contains.
2. Superscript numbers in chemical formulas tell how many
atoms of each element are found in a unit of compound.
3. All the noble gases except helium have 18 electrons in
their outer energy level.
4. A(n) chemical formula is the force that holds atoms
together in a compound.
5. An ion is a(n) neutral particle that has either more or
fewer electrons than protons.
6. Oxidation numbers are written as subscripts.
7. A(n) covalent bond is the force of attraction between the
opposite charges of the ions in an ionic compound.
8. The charge on a compound is always positive.
9. Equal sharing of electrons in covalent bonds results in
polar molecules.
10. Only two identical atoms can share electrons unequally.
11. A binary compound contains five different elements.
12. An oxidation number tells how many protons an atom
must gain, lose, or share to become stable.
13. The oxidation number of the copper(II) ion is 3+.
14. When writing chemical formulas, add superscripts so that
the sum of the oxidation numbers equals ten.
15. A polyatomic ion never has a positive or negative charge.
16. The polyatomic ion SO42− is called the sulfide ion.
Chemical Bonds
15
Name
Date
Class
Section 1 ■ Stability in Bonding
Section 2 ■ Types of Bonds
Directions: In the blanks, write the terms from the word list that complete the definition. Words can be used
more than once.
positive
element(s)
energy level(s)
force(s)
atom(s)
compound(s)
charged
ion(s)
number(s)
electron(s)
negative
1. A chemical formula tells what
make up a
and the exact
of atoms of
each element in a unit of compound.
2. An atom is chemically stable when its outer
is
completely filled with
.
3. A chemical bond is a
that holds
together in a compound.
4. An
that has lost or gained
is
called an ion.
5. An ionic bond is the
of attraction between the opposite
charges of the
in an ionic
6. The attraction that forms between
.
when they share
is known as a covalent bond.
7. A polar molecule has a slightly
end and a slightly
end.
8. A nonpolar molecule does not have oppositely
Only atoms that are exactly alike can share their
16 Chemical Bonds
ends.
equally.
Name
Date
Class
Section 3 ■ Writing Formulas
and Naming
Compounds
Directions: The words in each group below are related. Using all the words in the group, write a sentence that
shows how the words are related.
Example: compound, properties, elements
The properties of a compound differ from the properties of the elements that make up the compound.
1. hydrate, compound, water
2. oxidation number, element, electrons
3. zero, oxidation numbers, noble gases
4. oxidation number, Roman numeral, element
5. chemical formulas, neutral, compounds
6. polyatomic, covalent, charged
7. Greek prefixes, binary covalent compounds
8. charge, oxidation number, ionic compounds
Chemical Bonds
17
Name
Date
Class
Key Terms
Chemical Bonds
Directions: Match each term in Column I with its description in Column II. Write the letter of the correct term in
the space provided.
Column I
1. binary compound
2. chemically stable
3. nonpolar molecule
4. ion
5. ionic bond
6. polar molecule
7. oxidation number
8. chemical formula
9. covalent bond
10. hydrate
11. chemical bond
12. polyatomic ion
Column II
a. number that indicates how many electrons
an atom must gain, lose, or share to
become stable
b. shorthand that tells what elements a
compound contains and the exact number
of atoms of each element in a unit of the
compound
c. positively or negatively charged, covalently
bonded group of atoms
d. compound composed of two elements
e. describes an atom that has a full outermost
energy level
f. molecule that has a slightly positive end
and a slightly negative end
g. the attraction that forms between atoms
when they share electrons
h. the force that holds atoms together in a
compound
i. a compound that has water chemically
attached to it
j. the force of attraction between the opposite
charges of the ions in an ionic compound
k. molecule made of two identical atoms that
share the electrons equally
l. a charged particle that has either more or
fewer electrons than protons
18 Chemical Bonds