1.1. Structure: Carbon atoms bonded hexagonally with 3 other carbon atoms in a plane
1.2. Appearance: Blackish metal like earthy rockish flaky substance
1.3. m.p./b.p.: extremely high
1.4. predominant state: solid
1.5. conductivity: conductive because every carbon has 1 delocalised electron freely moving about the hexagonal plane
1.6. applications: pencils
1.7. Thermal conductivity: High
2. Graphene
2.1. Structure: A single sheet of graphite, where each carbon atom is bonded with 3 other carbon atoms on a hexagonal plane
2.2. Appearance: not visible to the naked eye in microscale, assumed to be similar to graphite given its chemical similarity
2.3. m.p./b.p.: extremely high
2.4. predominant state: solid
2.5. conductivity: conductive because every carbon has 1 delocalised electron freely moving about the hexagonal plane
2.6. applications: nanotubes
2.7. Thermal conductivity: High
3. Buckyballs
3.1. Structure: It has a cage-like fused-ring structure (truncated icosahedron) which resembles a football (soccer ball), made of twenty hexagons and twelve pentagons, with a carbon atom at each vertex of each polygon and a bond along each polygon edge. (wikipedia)
3.2. Appearance: dark needle like crystal
3.3. m.p./b.p.: high, sublimes
3.4. predominant state: solid
3.5. conductivity: semiconductor but becomes conductor when doped with alkali metals
3.6. applications: transport medicine using empty space
3.7. Thermal conductivity:
4. Diamond
4.1. Structure: Carbon atoms bonded to 4 other carbon atoms tetrahedrally.
4.2. Appearance: Transparent crystal
4.3. m.p./b.p.: extremely high
4.4. predominant state: solid
4.5. conductivity: not conducive because all electrons are in a bonding pair
