Define the following terms in relation to crystalline solids:(i) Unit

1.	Define the following terms in relation to crystalline solids:(i) Unit cell(ii) Coordination numberGive one example in each case.
Answer» (i) Unit cell: A unit cell is the smallest portion of a crystal lattice which, when repeated in different direction, generates the entire lattice. (ii) Coordination number: The number of nearest neighbours of any constituent particle in a packing is called its coordination number. The coordination number of an atom in the bcc structure is 8. i) Unit Cell:- Smallest element of a crystal lattice which on repetition gives the entire crystal lattice. Eg - cubic unit cell ii) Coordination Number :- The number of neighbour atoms attached to a central atom Eg - In hcp the C.N is 6 (three dimensional)

Define the following terms in relation to crystalline solids:(i) Unit cell(ii) Coordination numberGive one example in each case.

Answer»

(i) Unit cell: A unit cell is the smallest portion of a crystal lattice which, when repeated in different direction, generates the entire lattice.

(ii) Coordination number: The number of nearest neighbours of any constituent particle in a packing is called its coordination number. The coordination number of an atom in the bcc structure is 8.

i) Unit Cell:- Smallest element of a crystal lattice which on repetition gives the entire crystal lattice. Eg - cubic unit cell

ii) Coordination Number :- The number of neighbour atoms attached to a central atom Eg - In hcp the C.N is 6 (three dimensional)

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