DIAMOND There are NO MOLECULES This is a GIANT COVALENT NETWORK

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Presentation transcript:

DIAMOND There are NO MOLECULES This is a GIANT COVALENT NETWORK Each carbon is covalently bonded to FOUR others It is a tetrahedral arrangement There are NO MOLECULES This is a GIANT COVALENT NETWORK To melt diamond you need to break huge number of covalent bonds (which requires lots of energy) Carbon only has four electrons in its outer shell. These are all used in bonds so there are none free to conduct

GRAPHITE This is also a giant covalent structure Each carbon covalently bonded to three others in LAYERS Weak forces between layers This is also a giant covalent structure To melt graphite, covalent bonds must be broken Each carbon is only bonded to 3 others so there are free electrons between the layers that can move

FULLERENE C60 This is a (big) MOLECULE Melting point about 300C Other atoms (drugs?) can be held inside Each carbon is covalently bonded to three others to there are free electrons on the surface of the ball…

NANOTUBES NANOTECHNOLOGY

Material Bulk Nanoparticles GOLD Solid Liquid SILICON Insulator Conductor COPPER Opaque Transparent