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Crystal Structure of Sodium Chloride(NaCl) NaCl
is a ionic compound. Hence both Na and Cl are in ionic state. The molecule is under equilibrium because, the attractive force due to ions is balanced by repulsive force due to electron clouds. The Bravais lattice of NaCl is FCC with the basis containing one Na ion

Crystal Structure of Sodium Chloride and Diamond - Civil Engineering (CE)

and one Cl ion. The bond length is 2.813A˚ . For each atom there are 6 equidistant nearest neighbours of opposite kind. Hence the coordination number is 6. There are 12 next nearest neighbors of the same kind. The conventional cell which consists of four molecules of NaCl is as shown in the figure. The coordinates of the ions in the conventional cell is as given below. (taking Na ion as origin)
This structure could be considered as the superposed pattern of two interpenetrating Bravais
Crystal Structure of Sodium Chloride and Diamond - Civil Engineering (CE)
lattice each made of one type of ion

Crystal structure of Diamond(Allotropic form of carbon)
Diamond is an allotropic form of carbon. The Bravais lattice is an FCC similar to ZnS. There are 18 carbon atoms in the unit cell. 8 at corners, 6 at face centers and 4 at intermediate tetrahedral positions. The unit cell is as shown in the fig. In the unit cell, each carbon
Crystal Structure of Sodium Chloride and Diamond - Civil Engineering (CE)

atom bonds to four other carbon atoms in the form of a tetrahedron. Since each atom has four equidistant nearest neighbors the coordination number is 4.This structure could be considered as the superposed pattern of two interpenetrating Bravais FCC lattices each made of Carbon with one displaced from the other along 1/4th of the body diagonal. The interatomic distance is 1.54A˚ and the lattice constant 3.56A˚ .

Crystal Structure of Sodium Chloride and Diamond - Civil Engineering (CE)

 

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FAQs on Crystal Structure of Sodium Chloride and Diamond - Civil Engineering (CE)

1. What is the crystal structure of sodium chloride?
Ans. Sodium chloride has a crystal structure known as face-centered cubic (FCC) or rock salt structure. In this structure, each sodium ion is surrounded by six chloride ions and vice versa, forming a three-dimensional lattice arrangement.
2. How does the crystal structure of sodium chloride contribute to its properties?
Ans. The crystal structure of sodium chloride plays a significant role in determining its properties. The strong electrostatic attraction between the oppositely charged sodium and chloride ions results in its high melting and boiling points. Additionally, the crystal structure allows sodium chloride to form regular, symmetrical crystals and gives it a characteristic cleavage pattern.
3. What is the crystal structure of diamond?
Ans. Diamond has a crystal structure known as a face-centered cubic (FCC) lattice. In this structure, each carbon atom is covalently bonded to four neighboring carbon atoms, forming a rigid three-dimensional network. This arrangement gives diamond its exceptional hardness and stability.
4. How does the crystal structure of diamond contribute to its properties?
Ans. The crystal structure of diamond is responsible for its remarkable properties. The strong covalent bonds between carbon atoms result in diamond's extreme hardness, making it the hardest known natural material. Furthermore, the crystal lattice structure allows diamond to have excellent thermal conductivity and optical properties, such as high refractive index and dispersion.
5. How do the crystal structures of sodium chloride and diamond differ?
Ans. The crystal structures of sodium chloride and diamond differ in terms of the types of bonds and arrangements. Sodium chloride has an ionic crystal structure, where the sodium and chloride ions are held together by ionic bonds. On the other hand, diamond has a covalent crystal structure, with carbon atoms bonded together by strong covalent bonds. Sodium chloride forms a face-centered cubic lattice, while diamond forms a face-centered cubic lattice with a tetrahedral arrangement of carbon atoms.
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Crystal Structure of Sodium Chloride and Diamond - Civil Engineering (CE)

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