The table below shows information about three allotropes of carbon: diamond, graphite, and buckminsterfullerene (C60C_{60}C60).
| Allotrope | Covalent bonds per carbon atom | Type of structure |
|---|---|---|
| Diamond | ........................ | Giant covalent |
| Graphite | 3 | Giant covalent |
| Buckminsterfullerene (C60C_{60}C60) | 3 | ........................ |
Complete the table to show the covalent bonds per carbon atom in diamond and the type of structure of buckminsterfullerene (C60C_{60}C60).
Graphene can conduct electricity. Explain why graphene can conduct electricity. Use ideas about structure and bonding in your answer.
Silicon has a very high melting point. Explain why silicon has a very high melting point. Use ideas about structure and bonding in your answer.
Silicon dioxide (SiO2\text{SiO}_2SiO2) has a very high melting point (1710∘C1710^\circ\text{C}1710∘C), whereas sulfur dioxide (SO2\text{SO}_2SO2) is a gas at room temperature. Explain this difference in terms of structure and bonding.