NEET Chemistry The Solid State Questions Solved

BOARD

Define the following terms in relation to crystalline solids:

(i) unit cell    (ii) Coordination number

Give one example in each case.

(i) Unit cell : The smallest three dimensional portion of a complete space lattice which when repeated over and again in different directions produces the complete space lattice is called the unit cell.

Example : Cubic unit cell, Hexagonal unit cell etc.

(ii) Coordination number : The number of nearest spheres with which a particular sphere is in contact is called co-ordination number.

Example : Co-ordination number of hexagonal (hcp) structures is 12.

Difficulty Level:

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