# Solid State

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## Important Concepts in Solid State

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- Classification of Solids
- Amorphous Solids
- Crystalline Solids
- Unit Cell
- Packing in solids
- Interstitial Site (Voids)
- Bragg's Equation
- Imperfection in Solids
- Electrical, Magnetic and Dielectric properties.

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## Important Points

The faces , edges and interfacial angles are related as , f + c =e+2 ,Where f =no. of faces , e= no. of edges , c= no .of interfacial angles.

The law of symmetry states that all crystals of same substances possess the same elements of symmetry.

Density of unit cell= Mass of the unit cell /Volume of the unit cell

Number of unit cell (Z): no/8 +no/2 +ni/1 , where , nc = no of atoms at the corners of the cube ,nf = number of atoms at six faces of the cube , ni = no of atoms inside the cube.

The size of trigonal void is 0.115 times of the radius of the bigger sphere involved.

The law of symmetry states that all crystals of same substances possess the same elements of symmetry.

Density of unit cell= Mass of the unit cell /Volume of the unit cell

Number of unit cell (Z): no/8 +no/2 +ni/1 , where , nc = no of atoms at the corners of the cube ,nf = number of atoms at six faces of the cube , ni = no of atoms inside the cube.

The size of trigonal void is 0.115 times of the radius of the bigger sphere involved.