Question

① What are the Seven Chystal System? Name Bravais
laltices of each class​

Answer 1

Answer :

★ $\underline{\boxed{\bf{\orange{Seven\:crystal\:systems:}}}}$

1. Cubic (most symmetrical)

• Cu, ZnS, NaCl

2. Tetragonal

• Sn (White tin), CaSO₄

3. Orthorhombic or Rhombic

• Rhombic sulphur, BaSO₄

4. Monoclinic

• Monoclinic sulphur, PbCrO₄

5. Hexagonal

• Graphite, ZnO, CdS

6. Rhombohedral or Trigonal

• CaCO₃, HgS

7. Triclinic (most unsymmetrical)

• B(OH)₃, CuSO₄ • 5H₂O

Bravais lattices : The fourteen lattices corresponding to seven crystal system.

Cubic : (3)

• Primitive
• BCC
• FCC

Tetragonal : (2)

• Primitive
• BCC

Orthorhombic : (4)

• Primitive
• BCC
• FCC
• End-centred

Rhombohedral : (1)

• Primitive

Hexagonal : (1)

• Primitive

Monoclinic : (2)

• Primitive
• End-centred

Triclinic : (1)

• Primitive

Total bravais lattices :

⭆ 3 + 2 + 4 + 1 + 1 + 2 + 1 = 14

Answer 2

Answer :

★ $\underline{\boxed{\bf{\orange{Seven\:crystal\:systems:}}}}$

1. Cubic (most symmetrical)

Cu, ZnS, NaCl

2. Tetragonal

Sn (White tin), CaSO₄

3. Orthorhombic or Rhombic

Rhombic sulphur, BaSO₄

4. Monoclinic

Monoclinic sulphur, PbCrO₄

5. Hexagonal

Graphite, ZnO, CdS

6. Rhombohedral or Trigonal

CaCO₃, HgS

7. Triclinic (most unsymmetrical)

B(OH)₃, CuSO₄ • 5H₂O

Bravais lattices : The fourteen lattices corresponding to seven crystal system.

Cubic : (3)

Primitive

BCC

FCC

Tetragonal : (2)

Primitive

BCC

Orthorhombic : (4)

Primitive

BCC

FCC

End-centred

Rhombohedral : (1)

Primitive

Hexagonal : (1)

Primitive

Monoclinic : (2)

Primitive

End-centred

Triclinic : (1)

Primitive

Total bravais lattices :

⭆ 3 + 2 + 4 + 1 + 1 + 2 + 1 = 14