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Chapter 7: Ionic and Metallic Bonding Section 3: Bonding in Metals
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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
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Metallic Bonds and Metallic Properties “____ of electrons” –allows the metal ___________ to move freely past each other –gives metals their ______________.
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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
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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?
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Crystalline Structure of Metals Metals are considered ____________ –arranged in a very orderly, __________ pattern Several possible arrangements of metal ____________
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Crystalline Structure of Metals Body-centered cubic –________neighbors –Ex: sodium, _________, iron, chromium, _________
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Crystalline Structure of Metals Face centered cubic –____ neighbors –Silver, gold, ________, aluminum, ________
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Crystalline Structure of Metals Hexagonal close packed – ___ neighbors, but different from _____ __________ –magnesium, _____, and cadmium
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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)
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