DRILL

Determine the formation of the following ionic bonds.Li and BrNa and P

OBJECTIVE

SWBAT: Complete a Crystal Structures Lab activity in

order to investigate the geometric arrangement of atoms in crystalline solids.

SAT/HSA ENRICHMENT … was credited with creating the first Periodic

Table that organized the elements according to …

a. Dimitri Mendeleev … atomic mass.b. Ernest Rutherford … atomic mass.c. James Chadwick … atomic mass.d. Henry Moseley … atomic number.e. John Dalton … atomic number

Quiz

Chemical Bonding Quiz

Bonding in Metals

Bonding in MetalsYou have probably seen

decorative fences, railings, or weathervanes made of a metal called wrought iron. In this section, you will learn how metallic properties derive from the way that metal ions form bonds with one another.

Metallic Bonds and Metallic PropertiesThe valence electrons of metal atoms can be modeled as a sea of electrons.

The valence electrons are mobile and can drift freely from one part of the metal to another.

Metallic bonds consist of the attraction of the free-floating valence electrons for the positively charged metal ions.

Metallic Bonds and Metallic Properties

Metals are ductile —that is, they can be drawn into wires.

Metallic Bonds and Metallic Properties A force can change the shape of a metal.

A force can shatter an ionic crystal.

Crystalline Structure of Metals These tomatoes

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

Crystalline Structure of Metals

Metal atoms are arranged in very compact and orderly patterns.

Alloys

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.

Alloys

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

Alloys The most important alloys

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

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.

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.

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.

Section Quiz

Lab

Crystal StructuresPurpose

To investigate the geometric arrangement of atoms in crystalline solids.

Summary

1. Did we accomplish the objective? Explain.2. Describe in your own words how to

determine the Coordination number of an ion.

3. Compare and contrast the different crystals you created during the lab.

4. Did the coordination numbers differ depending on the crystal’s structure?