Chapter 7: Ionic and Metallic Bonding Section 3: Bonding in Metals

Metallic Bonds and Metallic Properties Metals –closely packed ________ in a sea of _________. Metallic bond –Positive __________ are attracted to the negative ___________. –Attraction holds the metal together

Metallic Bonds and Metallic Properties “____ of electrons” –allows the metal ___________ to move freely past each other –gives metals their ______________.

Metallic Bonds and Metallic Properties Properties –Good conductors- electrons can _______ ___________ –Ductile (drawn into wires)- electrons and cations can be __________ –Malleable (hammered or forced into shapes)- _____________ at one end of a piece of metal and be forced to the other

Practice What do ionic bonds and metallic bonds have in common? What are the differences between ionic and metallic bonds? What will happen to a metal if struck with a hammer? What will happen to an ionic crystal if struck with a hammer?

Crystalline Structure of Metals Metals are considered ____________ –arranged in a very orderly, __________ pattern Several possible arrangements of metal ____________

Crystalline Structure of Metals Body-centered cubic –________neighbors –Ex: sodium, _________, iron, chromium, _________

Crystalline Structure of Metals Face centered cubic –____ neighbors –Silver, gold, ________, aluminum, ________

Crystalline Structure of Metals Hexagonal close packed – ___ neighbors, but different from _____ __________ –magnesium, _____, and cadmium

Alloys Mixtures of two or ________ _____________, one must be a _________ More useful than their __________ __________ Examples –Cast Iron (Fe + _____) –Sterling silver (Ag + ______) –Bronze (Cu + ______) –Steel (Fe + _____) stainless spring surgical –titanium alloys (Ti + others)