Question

In graphite, the electrons are:

• A. localised on each carbon-atom
• B. localised on every third carbon-atom
  
  
• C. delocalised within the layer
• D. present in an anti-bonding orbital

Answer 1

The correct option is C delocalised within the layer

In graphite, each carbon atom is attached with three other carbon atoms via covalent bonds which leads to the formation of layers with hexagonal arrangement. Between the layers, carbon atoms are bonded by weak forces.
During bonding, carbon uses only 3 electrons out of 4 electrons in its valence shell. The 4th electron is delocalised within the layer.