Section 7.3 lecture for Honors & Prep chemistry

1. Bellwork- Determine Formula
What is the formula of the compound
formed between the following ions.
1. Calcium ion and bromide ion
2. Potassium ion and sulfide ion
3. Aluminum ion and selenide ion

2. Lecture 7.3 – Metallic Bonds

3. Lecture 7.3 – Metallic Bonds
Ionic bonds are formed between a
metal cation and a non-metal anion.

4. Lecture 7.3 – Metallic Bonds
Ionic bonds are formed between a
metal cation and a non-metal anion.
Metallic bonds are formed between
two or more metal cations.

5. Sea of Valence Electrons Model

6. • Metalof Valence Electrons Model
Sea atoms release their valence
electrons into a sea of valence electrons
shared by all of the metal atoms.

7. • Metalof Valence Electrons Model
Sea atoms release their valence
electrons into a sea of valence electrons
shared by all of the metal atoms.
•The attraction of these free electrons to
the metal cations is called a metallic
bond.

9. Atomic View of Metallic Bonding

10. Atomic View of Metallic Bonding
A Group 2 metal
Each atom
releases its two
valence electrons
into a pool of
electrons to be
shared by all of
the metal atoms.

11. Metals are
ductile—they
can be drawn
into wires.

12. A force can change the shape
of a metal. A force can shatter
an ionic crystal.

13. A force can change the shape
of a metal. A force can shatter
an ionic crystal.

14. A force can change the shape
of a metal. A force can shatter
an ionic crystal.

15. See how metallic bonding explains
some physical properties of metals.

16. See how metallic bonding explains
some physical properties of metals.

17. Metals are good electrical
conductors because the valence
electrons are free to travel.

18. Atomic View of Metallic Bonding

19. Atomic View of Metallic Bonding
• Bonding in metals is
not rigid.

20. Atomic View of Metallic Bonding
• Bonding in metals is
not rigid.
• As a metal is struck
by a hammer, the
atoms slide through
the electron sea to
new positions while continuing to maintain
their connections to each other.

21. Atomic View of Metallic Bonding
• Bonding in metals is
not rigid.
• As a metal is struck
by a hammer, the
atoms slide through
the electron sea to
new positions while continuing to maintain
their connections to each other.
• The same ability to reorganize explains why
metals can be pulled into long, thin wires.

22. Metal atoms are arranged in very
compact and orderly patterns.

23. Metal atoms are arranged in very
compact and orderly patterns.

24. Metal atoms are arranged in very
compact and orderly patterns.

25. Metal atoms are arranged in very
compact and orderly patterns.

26. These tomatoes
have a closed-
packed
arrangement.
Similar
arrangements can
be found in the
crystalline structure
of metals.

27. Alloys are mixtures composed of
two or more elements, at least one
of which is a metal.

28. Alloys are mixtures composed of
two or more elements, at least one
of which is a metal.
Alloys are important because
their properties are often
superior to those of their
component elements.

29. Bicycle frames are often made of
titanium alloys that contain aluminum
and vanadium.

30. The most
important alloys
today are steels.
Steels have a wide
range of useful
properties, such as
corrosion resistance,
ductility, hardness,
and toughness.

31. 7.3 Section Quiz.
1. The valence electrons of metals
can be modeled as
a. a body-centered cube.
b. octets of electrons.
c. a rigid array of electrons.
d. a sea of electrons.

32. 7.3 Section Quiz.
1. The valence electrons of metals
can be modeled as
a. a body-centered cube.
b. octets of electrons.
c. a rigid array of electrons.
d. a sea of electrons.

33. 7.3 Section Quiz.
2. In most metals, the atoms are
a. free to move from one part of the
metal to another.
b. arranged in a compact and orderly
pattern.
c. placed at irregular locations.
d. randomly distributed.

34. 7.3 Section Quiz.
2. In most metals, the atoms are
a. free to move from one part of the
metal to another.
b. arranged in a compact and orderly
pattern.
c. placed at irregular locations.
d. randomly distributed.

35. 7.3 Section Quiz.
3. Alloys are important because they
a. are pure substances.
b. are the ores from which metals can
be refined.
c. can have properties superior to
those of their components.
d. are produced by the combustion of
metals.

36. 7.3 Section Quiz.
3. Alloys are important because they
a. are pure substances.
b. are the ores from which metals can
be refined.
c. can have properties superior to
those of their components.
d. are produced by the combustion of
metals.