(c) What atomic orbitals are involved in the stacking of graphite sheets with each other?

Key Concepts

Atomic Orbitals

Atomic orbitals are regions in an atom where there is a high probability of finding electrons. They are defined by quantum mechanics and include s, p, d, and f orbitals. In graphite, the relevant orbitals are primarily the sp² hybridized orbitals, which allow for the formation of sigma bonds between carbon atoms in the planar sheets.

Graphite Structure

Graphite consists of layers of carbon atoms arranged in a hexagonal lattice. Each carbon atom is bonded to three others in the same plane, forming strong covalent bonds. The layers are held together by weaker van der Waals forces, allowing them to slide over each other, which is why graphite is slippery and used as a lubricant.

Interlayer Interactions

The interactions between the layers of graphite are primarily due to van der Waals forces, which are weak compared to covalent bonds. These forces arise from temporary dipoles that occur when electron distributions around atoms fluctuate. Understanding these interactions is crucial for explaining the physical properties of graphite, such as its electrical conductivity and lubricating ability.