Concept:Graphite is a form of element carbon (
C) in which strong covalent bonds act within each layer, while only weak forces act between layers.
Explanation:Inside a single graphite layer, each carbon atom bonds covalently to three neighbouring atoms.
These strong covalent bonds hold the atoms together within the layer.
No covalent or ionic bond exists between adjacent layers.
The crystal layers are held by weak van der Waals forces.
These weak forces make the layers slide easily, giving graphite its soft feel.
Thus, the forces between crystal layers are van der Waals forces, not covalent or ionic bonds.
Answer:D. van der Waal's forces