Question

1.7
How will you distinguish between the following pairs of terms:
(i) Hexagonal close-packing and cubic close-packing?
(ii) Crystal lattice and unit cell?
(iii) Tetrahedral void and octahedral void?​

Answer 1

Hexagonal close packing- when the tetrahadel voids of the second layer is covered by spheres of third layer so that the spheres of third layer is totally alinged is called hexagonal close packing.

Cubic close packing- when the third layer is placed above the second layer in a manner such that it's spheres cover the octahedral voids and spheres of third layer are not aligned to first layer this is cubic close packing.

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Answer 2

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• How will you distinguish between the following pairs of terms:

(i) Hexagonal close-packing and cubic close-packing?

(ii) Crystal lattice and unit cell?

(iii) Tetrahedral void and octahedral void?

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① ➥Hexagonal close packing

➻ In this case, the sphere of the third layer are exactly aligned with those of the first layer. Thus the pattern of the sphere can be written as AB AB - - - pattern

➻In hexagonal closed packing tetrahedral voids of the second layer may be covered by the sphere of the third layer.

➥Cubic close packing

➻ In cubic close packing, the spheres of the third layer are not aligned with those of the first layer or second layer. Only when fourth layer is placed, its spheres are aligned with those of the first layer. This pattern is often written as ABC ABC - -

➻ In cubic closed sphere, third layer may be placed above the second layer in a manner such that its spheres convert the octahedral voids.

② ➥Crystal lattice and unit cell:

➻If the three dimensional arrangement of constituent particles in a crystal represented diagrammatically in which each particle is depicted as a point, the arrangement is called a 'crystal lattice' where unit cell is the smallest portion of a crystal lattice which when repeated in different directions generates the entire lattice.

③ ➥Tetrahedral void and octahedral void:

➻ A simpler triangular void in a crystal is surrounded by four spheres is called a tetrahedral void or a hole. Where octahedral void is a double triangular void is surrounded by six spheres.

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