covalent - type of bond where electrons are shared, giant - describes an extensive lattice structure, high - melting point of diamond, no free electrons - why does diamond not conduct electricity?, free electrons - why does graphite conduct electricity?, tetrahedron - describes the shape the carbon atoms make in diamond, cutting tools - a use of diamond in industry, silicon dioxide - a giant covalent structure with the symbol SiO2, 4 - number of covalent bonds between carbon atoms in diamond, 3 - number of covalent bonds between carbon atoms in graphite, pencils and lubricant - uses of graphite, weak bonds - present between the layers in graphite, hexagonal - the shape of carbon rings in graphite, graphene - a single layer of graphite, fullerenes - hollow shaped molecules made of carbon, 1 to 100 nm - size of nanoparticles, 100 to 2500 nm - size of "fine" particles, dust - another name for "coarse" particles in chemistry, cosmetics, deodorants, catalysts, electronics - some uses for nanoparticles, We just don't know because it's so new - What's the problem with using nanoparticles for medicine delivery and technology?,

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