# Solid State Subject: Chemistry    Exam: AP EAMCET Medical (AM)

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## Important Concepts in Solid State

Find notes, videos, important points and questions to practice on each of these concepts.

• 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. SimplyLearnt