Compare the structure of the crystal of diamond graphite with special reference to the reason for diamond being the hardest natural substance while graphite one of the softest. Compare the electrical & thermal conductivity of the two crystalline allotropes of carbon.

Elemental carbon appears in many structural forms or allotropes . Three of these forms are crystalline -diamond ,graphite and the recently discovered fullerene (bucky ball ) -while more than 40 others including coke and carbon black are amorphous . Now there seems to be set as fourth crystalline allotrope of carbon. reported in 1995 by Lagow at the University of Texas . Newly discovered allotrope of carbon has the form :

With reference to the structure of the two crystalline allotropes of carbon, state why diamond is inert or unreactive while graphite in comparably more reactive,

Elemental carbon appears in many structural forms or allotropes . Three of these formssare crystalline -diamond ,graphite and the recentluy discovered fullerne (bucky ball ) -while more than 40 others including coke and carbon black ae amorphous . Now there seems to be set afourth crystalline allotrope of carbon. reported in 1995 by Lagow at the University of Texas . Structures fodifferentallotropes of carbon have been compared . Which represents incorrect comparison ?

_______, ________ and _____ are the three crystalline forms of carbon.

Name the following: A crystalline allotrope of carbon built up from a hexagonal unit.

Name the following: An allotrope of carbon used for the manufacture of coke.

Define allotropy. Name the various allotropes of carbon.

A crystalline solid

Nanotubes are formed by fullerenes allotrope of carbon.