Ionic compounds are formed when ions bond via ionic bonds. Ions form when atoms gain or lose electrons to achieve a stable electron configuration. Ionic bonds result from the electrostatic attraction between oppositely charged ions. Ionic compounds consist of a crystal lattice structure where ions are arranged in a repeating pattern. Metals form metallic bonds where delocalized electrons are attracted to metallic cations. Alloys are mixtures of metals or metals with other elements that have distinct properties from their components.

2. Ionic Compounds and Metals
Section 7.1 Ion Formation
Section 7.2 Ionic Bonds and Ionic
Compounds
Section 7.3 Names and Formulas
for Ionic Compounds
Section 7.4 Metallic Bonds and the
Properties of Metals
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3. Section 7.1 Ion Formation
• Define a chemical bond. octet rule: atoms tend to
gain, lose, or share
electrons in order to acquire
eight valence electrons
chemical bond
cation
anion
• Describe the formation of
positive and negative ions.
• Relate ion formation to
electron configuration.
Ions are formed when atoms gain or
lose valence electrons to achieve a
stable octet electron configuration.

4. Valence Electrons and Chemical Bonds
• A chemical bond is the force that holds
two atoms together.
• Chemical bonds form by the attraction
between the positive nucleus of one atom
and the negative electrons of another atom.

5. Valence Electrons and Chemical Bonds (cont.)
• Atom’s try to form the octet—the stable
arrangement of eight valence electrons in
the outer energy level—by gaining or losing
valence electrons.

6. Positive Ion Formation
• A positively charged ion is
called a cation.
• This figure illustrates how
sodium loses one valence
electron to become a
sodium cation.

7. Positive Ion Formation (cont.)
• Metals are reactive because they lose
valence electrons easily.

8. Positive Ion Formation (cont.)
• Transition metals commonly form 2+ or 3+
ions, but can form greater than 3+ ions.
• Other relatively stable electron arrangements
are referred to as pseudo-noble gas
configurations.

9. Negative Ion Formation
• An anion is a negatively
charged ion.
• The figure shown here
illustrates chlorine gaining
an electron to become a
chlorine ion.

10. Negative Ion Formation (cont.)
• Nonmetal ions gain the number of
electrons required to fill an octet.
• Some nonmetals can gain or lose electrons to
complete an octet.

11. A. A
B. B
C. C
D. D
A
B
C
D
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Section 7.1 Assessment
Oxygen gains two electrons to form what
kind of ion?
A. 1– anion
B. 2– anion
C. 1+ cation
D. 2+ cation

12. A. A
B. B
C. C
D. D
A
B
C
D
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0%
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Section 7.1 Assessment
Elements with a full octet have which
configuration?
A. ionic configuration
B. halogen configuration
C. noble gas configuration
D. transition metal configuration

13. Compound Lattice Energy
LiF -1032
LiCl -852
LiBr -815
LiI -761
NaF -926
NaCl -786
NaBr -752
NaI -702
KF -813
KCl -717
KBr -689
KI -649
RbF
RbCl
RbBr
RbI

15. Section 7.2 Ionic Bonds and Ionic Compounds
• Describe the formation of ionic bonds and the
structure of ionic compounds.
compound: a chemical combination of two or more
different elements
• Generalize about the strength of ionic bonds based
on the physical properties of ionic compounds.
• Categorize ionic bond formation as exothermic or
endothermic.

16. Section 7.2 Ionic Bonds and Ionic Compounds
(cont.)
ionic bond
ionic compound
crystal lattice
electrolyte
lattice energy
Oppositely charged ions attract each
other, forming electrically neutral ionic
compounds.

17. Formation of an Ionic Bond
• The electrostatic force that holds oppositely
charged particles together in an ionic
compound is called an ionic bond.
• Compounds that contain ionic bonds are
called ionic compounds.
• Binary ionic compounds contain only two
different elements—a metallic cation and a
nonmetallic anion.

18. Formation of an Ionic Bond (cont.)

19. Properties of Ionic Compounds
• Positive and negative ions exist in a ratio
determined by the number of electrons
transferred from the metal atom to the non-
metal atom.
• The repeating pattern of
particle packing in an
ionic compound is called
an ionic crystal.

20. Properties of Ionic Compounds (cont.)
• The strong attractions among the positive
and negative ions result in the formation of
the crystal lattice.
• A crystal lattice is the three-dimensional
geometric arrangement of particles, and is
responsible for the structure of many
minerals.

21. Properties of Ionic Compounds (cont.)
• Melting point, boiling point, and hardness
depend on the strength of the attraction.

22. Properties of Ionic Compounds (cont.)
• In a solid, ions are locked into position and
electrons cannot flow freely—solid ions are
poor conductors of electricity.
• Liquid ions or ions in aqueous solution have
electrons that are free to move, so they
conduct electricity easily.
• An ion in aqueous solution that conducts
electricity is an electrolyte.

23. Properties of Ionic Compounds (cont.)
• This figure demonstrates how and why
crystals break when an external force is
applied.

24. Energy and the Ionic Bond
• Reactions that absorb energy are
endothermic.
• Reactions that release energy are
exothermic.

25. Energy and the Ionic Bond (cont.)
• The energy required to separate 1 mol of
ions in an ionic compound is referred to as
the lattice energy.
• Lattice energy is directly related to the size of
the ions that are bonded.

26. Energy and the Ionic Bond (cont.)
• Smaller ions form compounds with more
closely spaced ionic charges, and require
more energy to separate.
• Electrostatic force of attraction is inversely
related to the distance between the opposite
charges.
• The smaller the ion, the greater the attraction.

27. Energy and the Ionic Bond (cont.)
• The value of lattice energy is also affected
by the charge of the ion.

28. A. A
B. B
C. C
D. D
A
B
C
D
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0%
0%
Section 7.2 Assessment
Why are solid ionic compounds poor
conductors of electricity?
A. They are non-metals.
B. They are electrolytes.
C. They have electrons that
cannot flow freely.
D. Solids do not conduct electricity.

29. A. A
B. B
C. C
D. D
Section 7.2 Assessment
A
B
C
D
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What is the electrostatic charge holding
two ions together?
A. covalent bond
B. pseudo-noble gas bond
C. crystal lattice bond
D. ionic bond

31. Section 7.3 Names and Formulas for
Ionic Compounds
• Relate a formula unit of an ionic compound to its
composition.
nonmetal: an element that is generally a gas or a
dull, brittle solid and is a poor conductor of heat and
electricity
• Write formulas for ionic compounds and oxyanions.
• Apply naming conventions to ionic compounds and
oxyanions.

32. Section 7.3 Names and Formulas for
Ionic Compounds (cont.)
formula unit
monatomic ion
oxidation number
polyatomic ion
oxyanion
In written names and formulas for ionic
compounds, the cation appears first,
followed by the anion.

33. Formulas for Ionic Compounds
• When writing names and formulas for ionic
compounds, the cation appears first
followed by the anion.
• Chemists around the world need to
communicate with one another, so a
standardized system of naming compounds
was developed.

34. Formulas for Ionic Compounds (cont.)
• A formula unit represents the simplest
ratio of the ions involved.
• Monatomic ions are one-atom ions.

35. Formulas for Ionic Compounds (cont.)
• Oxidation number, or oxidation state, is
the charge of a monatomic ion.

36. Formulas for Ionic Compounds (cont.)
• The symbol for the cation is always written
first, followed by the symbol of the anion.
• Subscripts represent the number of ions of
each element in an ionic compound.
• The total charge must equal zero in an ionic
compound.

37. Formulas for Ionic Compounds (cont.)
• Polyatomic ions are ions made
up of more than one atom.
• Never change subscripts of
polyatomic ions, place in
parentheses and write the
appropriate subscript outside the
parentheses.

38. Formulas for Ionic Compounds (cont.)

39. Names for Ions and Ionic Compounds
• An oxyanion is a polyatomic ion
composed of an element (usually a non-
metal), bonded to one or more oxygen
atoms.

40. Names for Ions and Ionic Compounds (cont.)

41. Names for Ions and Ionic Compounds (cont.)
• Chemical nomenclature is a systematic
way of naming compounds.
– Name the cation followed by the anion.
– For monatomic, cations use the element name.
– For monatomic anions, use the root element name
and the suffix –ide.
– To distinguish between different oxidation states of
the same element, the oxidation state is written in
parentheses after the name of the cation.
– When the compound contains a polyatomic ion,
name the cation followed by the name of the
polyatomic ion.

42. Names for Ions and Ionic Compounds (cont.)

43. A. A
B. B
C. C
D. D
A
B
C
D
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0%
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Section 7.3 Assessment
Which subscripts would you most likely
use for an ionic compound containing an
alkali metal and a halogen? (Remember,
1 = no written subscript)
A. 1 and 2
B. 2 and 1
C. 2 and 3
D. 1 and 1

44. A. A
B. B
C. C
D. D
Section 7.3 Assessment
A
B
C
D
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0%
0%
What is the name of the compound
CaOH?
A. calcium oxide
B. calcium(I)oxide
C. calcium hydroxide
D. calcium peroxide

46. Section 7.4 Metallic Bonds and the
Properties of Metals
• Describe a metallic bond.
physical property: a characteristic of matter that
can be observed or measured without altering the
sample’s composition
• Relate the electron sea model to the physical
properties of metals.
• Define alloys, and categorize them into two basic
types.

47. Section 7.4 Metallic Bonds and the
Properties of Metals (cont.)
electron sea model
delocalized electron
metallic bond
alloy
Metals form crystal lattices and can be
modeled as cations surrounded by a
“sea” of freely moving valence
electrons.

48. Metallic Bonds and the Properties of Metals
• Metals are not ionic but share several
properties with ionic compounds.
• Metals also form lattices in the solid state,
where 8 to 12 other atoms closely surround
each metal atom.

49. Metallic Bonds and the Properties of Metals
(cont.)
• Within the crowded lattice, the outer energy
levels of metal atoms overlap.
• The electron sea model proposes that all
metal atoms in a metallic solid contribute their
valence electrons to form a "sea" of electrons.
• The electrons are free to move around and
are referred to as delocalized electrons,
forming a metallic cation.

50. Metallic Bonds and the Properties of Metals
(cont.)
• A metallic bond is the attraction of an
metallic cation for delocalized electrons.

51. Metallic Bonds and the Properties of Metals
(cont.)
• Boiling points are
much more extreme
than melting points
because of the
energy required to
separate atoms from
the groups of cations
and electrons.

52. Metallic Bonds and the Properties of Metals
(cont.)
• Metals are malleable because they can be
hammered into sheets.
• Metals are ductile because they can be
drawn into wires.

53. Metallic Bonds and the Properties of Metals
(cont.)
• Mobile electrons around cations make
metals good conductors of electricity and
heat.
• As the number of delocalized electrons
increases, so does hardness and strength.

54. Metal Alloys
• An alloy is a mixture of elements that has
metallic properties.
• The properties of alloys differ from the
elements they contain.

55. Metal Alloys (cont.)

56. Metal Alloys (cont.)
• Substitutional alloys are formed when
some atoms in the original metallic solid
are replaced by other metals of similar
atomic structure.
• Interstitial alloys are formed when small
holes in a metallic crystal are filled with
smaller atoms.

57. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
Section 7.4 Assessment
The attraction of a metallic cation and
delocalized electrons forms what kind of
bond?
A. ionic
B. covalent
C. diatomic
D. metallic

58. A. A
B. B
C. C
D. D
Section 7.4 Assessment
A
B
C
D
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0%
0%
Which property of metals allows them to
be easily drawn into wires?
A. malleability
B. ductility
C. conductivity
D. durability

60. Chemistry Online
Study Guide
Chapter Assessment
Standardized Test Practice
Image Bank
Concepts in Motion

61. Section 7.1 Ion Formation
Key Concepts
• A chemical bond is the force that holds two atoms
together.
• Some atoms form ions to gain stability. This stable
configuration involves a complete outer energy level,
usually consisting of eight valence electrons.
• Ions are formed by the loss or gain of valence
electrons.
• The number of protons remains unchanged during ion
formation.

62. Section 7.2 Ionic Bonds and
Ionic Compounds
Key Concepts
• Ionic compounds contain ionic bonds formed by the
attraction of oppositely charged ions.
• Ions in an ionic compound are arranged in a
repeating pattern known as a crystal lattice.
• Ionic compound properties are related to ionic bond
strength.
• Ionic compounds are electrolytes; they conduct an
electric current in the liquid phase and in aqueous
solution.

63. Section 7.2 Ionic Bonds and
Ionic Compounds (cont.)
Key Concepts
• Lattice energy is the energy needed to remove 1 mol of
ions from its crystal lattice.

64. Section 7.3 Names and Formulas for
Ionic Compounds
Key Concepts
• A formula unit gives the ratio of cations to anions in
the ionic compound.
• A monatomic ion is formed from one atom. The charge
of a monatomic ion is its oxidation number.
• Roman numerals indicate the oxidation number of
cations having multiple possible oxidation states.
• Polyatomic ions consist of more than one atom and act
as a single unit.

65. Section 7.3 Names and Formulas for
Ionic Compounds (cont.)
Key Concepts
• To indicate more than one polyatomic ion in a
chemical formula, place parentheses around the
polyatomic ion and use a subscript.

66. Section 7.4 Metallic Bonds and the
Properties of Metals
Key Concepts
• A metallic bond forms when metal cations attract
freely moving, delocalized valence electrons.
• In the electron sea model, electrons move through the
metallic crystal and are not held by any particular atom.
• The electron sea model explains the physical
properties of metallic solids.
• Metal alloys are formed when a metal is mixed with one
or more other elements.

67. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
Cations form when atoms _______
electrons.
A. gain
B. lose
C. charge
D. delocalize

68. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
What is the repeating pattern of atoms in
an ionic solid called?
A. crystal lattice
B. ionic lattice
C. energy lattice
D. ionic bonding

69. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
Give the name of the following: NaClO4
A. sodium hypochlorite
B. sodium chlorite
C. sodium chlorate
D. sodium perchlorate

70. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
As the distance between ions in an ionic
bond is shortened,
A. the energy to break the bond
decreases.
B. the electrostatic attraction
decreases.
C. the electrostatic attraction
increases.
D. the ionic bond changes to a
metallic bond.

71. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
An alloy is what type of substance?
A. heterogeneous mixture
B. compound
C. mixture of elements
D. element

72. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
Which is NOT true about metallic solids?
A. Metals are shiny.
B. Metals are good conductors of
heat and electricity.
C. Metals are ductile.
D. Metals have relatively low
boiling points.

73. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
Electrons in an atom’s outer most energy
level are referred to as what?
A. ions
B. cations
C. valence electrons
D. noble-gas electrons

74. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
What is the oxidation state of copper in
Cu(II)Cl2?
A. 1+
B. 2+
C. 2–
D. unable to determine

75. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
Which elements naturally occur with a full
octet of valence electrons?
A. alkali metals
B. alkali earth metals
C. halogens
D. noble gases

76. A. A
B. B
C. C
D. D
A
B
C
D
0% 0%
0%
0%
How many electrons are in a full octet?
A. 10
B. 8
C. 6
D. 4

77. Click on an image to enlarge.

100. Table 7.1 Electron-Dot Structure
Table 7.4 Formation of Sodium Chloride

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