What is the similarity between diamond and graphite. 

CONCEPT:

Diamond and Graphite

• Diamond and graphite are both allotropes of carbon, meaning they are different structural forms of the same element, carbon.
• Both diamond and graphite consist of carbon atoms, but they have different arrangements and bonding structures.
• Diamond has a tetrahedral structure where each carbon atom is bonded to four other carbon atoms in a three-dimensional network.
• Graphite has a planar hexagonal structure where each carbon atom is bonded to three other carbon atoms, forming layers that can slide over each other.

EXPLANATION:

• The similarity between diamond and graphite:
  • Both diamond and graphite are covalent or network solids.
  • This means that they are composed of a continuous network of covalent bonds extending throughout the material.
• While their physical properties differ significantly (diamond is hard and an insulator, whereas graphite is soft and a conductor), the fundamental similarity lies in their bonding and structure as covalent network solids.

Therefore, the correct option is 4) Both are covalent or network solids.