Metallic Bonds and Properties of Metals Metals Metals
![Metallic Bonds and Properties of Metals Metallic Bonds and Properties of Metals](https://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-1.jpg)
Metallic Bonds and Properties of Metals
![Metals • Metals are made up of closely packed cations surrounded by electrons, rather Metals • Metals are made up of closely packed cations surrounded by electrons, rather](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-2.jpg)
Metals • Metals are made up of closely packed cations surrounded by electrons, rather than neutral atoms or ions • Outer electron clouds of the metal ions overlap
![• Electron sea model – metals in a solid contribute their valence electrons • Electron sea model – metals in a solid contribute their valence electrons](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-3.jpg)
• Electron sea model – metals in a solid contribute their valence electrons to form a “sea of electrons” – Valence electrons are not held by any specific atom and can move easily from one atom to the next • Delocalized electrons –are free to move in the “sea of electrons”
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![Metallic Bond • Definition: The attraction of the delocalized electrons for the positively charged Metallic Bond • Definition: The attraction of the delocalized electrons for the positively charged](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-5.jpg)
Metallic Bond • Definition: The attraction of the delocalized electrons for the positively charged metal ions • Metal bonded to metal • Each ion is bonded to all neighboring cations by the “sea” of valence electrons
![Properties of Metals • In general, metals have moderately high melting and boiling points Properties of Metals • In general, metals have moderately high melting and boiling points](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-6.jpg)
Properties of Metals • In general, metals have moderately high melting and boiling points • Good conductors of heat and electricity • Malleable and Ductile – Mobile electrons can easily be pushed or pulled past each other
![Structure of Metals • Metal atoms are arranged in very compact and orderly patterns Structure of Metals • Metal atoms are arranged in very compact and orderly patterns](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-7.jpg)
Structure of Metals • Metal atoms are arranged in very compact and orderly patterns • Metals that contain just one kind of atom are among the simplest forms of all crystalline solids
![Metal Alloys • Alloy is a mixture of two or more elements (at least Metal Alloys • Alloy is a mixture of two or more elements (at least](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-8.jpg)
Metal Alloys • Alloy is a mixture of two or more elements (at least one must be a metal) • Alloy has metallic properties often superior to those of their component elements -Bronze: copper + tin -Steel: iron + carbon + other metals -Sterling silver: silver + copper
![Zn Brass though a magnifier Brass at the atomic level Cu Zn Brass though a magnifier Brass at the atomic level Cu](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-9.jpg)
Zn Brass though a magnifier Brass at the atomic level Cu
![2 common types of Alloys • Substitutional: one metal about the size of the 2 common types of Alloys • Substitutional: one metal about the size of the](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-10.jpg)
2 common types of Alloys • Substitutional: one metal about the size of the other replaces it examples: Brass, pewter, 10 -carat gold • Interstitial: one metal smaller than the other fits between it example: Carbon steel
![Types of Alloys Substitutional • Atoms have relatively the same size Interstitial • Atoms Types of Alloys Substitutional • Atoms have relatively the same size Interstitial • Atoms](http://slidetodoc.com/presentation_image_h/ca0194e8ba40395f246537440bf30881/image-11.jpg)
Types of Alloys Substitutional • Atoms have relatively the same size Interstitial • Atoms of different sizes
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