Carbon hexagonal lattice. As of 2009, graphene appears to be the strongest material ever tested. The process of separating it from graphite will require some further technological development before it is economical for industrial processes. If successful, graphene could be used in the construction of a space elevator. It could also be used to safely store hydrogen for use in a hydrogen based engine in cars. The amorphous form is an assortment of carbon atoms in a non-crystalline, irregular, glassy state, not held in a crystalline macrostructure. It is present as a powder, and is the main constituent of substances such
Asymmetric carbon atoms are not attached to exactly the same things, there are two different "groups" of atoms that the carbon atom in question is attached to, therefore making it an asymmetric carbon atom: A tetrose with 2 asymmetric carbon atoms has 2 = 4 stereoisomers: An aldopentose with 3 asymmetric carbon atoms has 2 = 8 stereoisomers: An aldohexose with 4 asymmetric carbon atoms has 2 = 16 stereoisomers: The four groups of atoms attached to the carbon atom can be arranged in space in two different ways that are mirror images of each other, and which lead to so-called left-handed