The crystallographic structure of NaCl sodium chloride is a face-centered cubic FCC lattice, also known as the rock salt structure. In this structure, each sodium ion Na+ is surrounded by six chloride ions Cl- and vice versa, forming an octahedral coordination geometry. The NaCl structure is highly ordered, with alternating positive and negative ions in a 3D lattice.The crystal structure of NaCl affects its physical properties in several ways:1. High melting and boiling points: The strong electrostatic attraction between the Na+ and Cl- ions in the lattice requires a significant amount of energy to break, resulting in high melting 801C and boiling 1413C points.2. Brittleness: The ionic bonds in the NaCl lattice are non-directional, and any displacement of ions can cause the same charges to be brought close together, leading to repulsion and cleavage of the crystal. This makes NaCl brittle.3. Electrical conductivity: In the solid state, NaCl does not conduct electricity because the ions are fixed in the lattice. However, when dissolved in water or in the molten state, the ions become free to move, allowing NaCl to conduct electricity.4. Solubility: NaCl is highly soluble in water due to the strong attraction between the polar water molecules and the charged ions in the lattice.The crystal structure of CsCl cesium chloride differs from that of NaCl. CsCl has a simple cubic structure, where each cesium ion Cs+ is surrounded by eight chloride ions Cl- and vice versa, forming a cubic coordination geometry. Although both NaCl and CsCl have 1:1 stoichiometry of cations and anions, their lattice structures and coordination geometries are different due to the larger size of the Cs+ ion compared to the Na+ ion.The crystal structure of diamond is entirely different from both NaCl and CsCl. Diamond has a covalent network structure, where each carbon atom is covalently bonded to four other carbon atoms in a tetrahedral arrangement. This results in a highly ordered and strong 3D network of carbon atoms. The properties of diamond, such as extreme hardness, high thermal conductivity, and electrical insulating behavior, are a result of this strong covalent bonding and network structure.