A form of carbon in which graphite-like sheets of carbon atoms form balls or tubes. - Buckminster fullerene, A type of Buckminster fullerene in which the sheet structures of carbon atoms are rolled into very thin tubes. Also called buckytubes. - carbon nanotube, A property of a substance that describes its ability to allow energy (electricity or heat) to pass through it. - conductivity, A chemical bond that forms when two atoms share a pair of electrons. - covalent bond, A very hard, natural form of carbon which has a 3-D giant covalent structure in which every atom is joined to four neighbours. - diamond, A structure built from billions of atoms in which every atoms is joined to its neighbours by strong covalent bonds. - giant molecular covalent structure, A very soft, natural form of carbon which has a sheet-like giant covalent structure in which every atom is joined to just three neighbours. - graphite, A family of reactive non-metals found in Group 7of the Periodic table. - halogen, A form of ‘alternative’ medicine based on the ‘like cures like’ principle using very dilute forms of natural materials. - homeopathic, The force of the attraction between molecules. - inter-molecular force, Atoms joined together by covalent bonds to form individual molecules which may be as small as two atoms. - simple molecular covalent structure,

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