Are bonded atoms " stuck " together ?
For example , the allotropes of carbon include diamond ( where the carbon atoms are bonded together in a tetrahedral lattice arrangement ) , graphite ( where the carbon atoms are bonded together in sheets of a hexagonal lattice ) , graphene ( single sheets of graphite ) , and fullerenes ( where the carbon atoms are bonded together in spherical , tubular , or ellipsoidal formations ) .