PBS
Pbs Teachers: Why the Towers Fell: The Structure of Metal
Examine what it is that gives metal its special characteristics and how metal behaves under the stress of heat and outside forces. An engaging interactive feature is offered to here to illustrate this concept.
CK-12 Foundation
Ck 12: Physical Science: Ionic Bonding
[Free Registration/Login may be required to access all resource tools.] Ionic bonds: How and why they form, and the role of energy in their formation.