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Packing refers to the arrangement of con...

Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two dimension there are square close packing and hexagonal close packing, cubic close packing and body-centred cubic packing
i) hcp: AB AB AB AB .... arrangement Coordination no. = 12 , `%` occupied space `= 74%`
ii) ccp: ABC ABC ....... arrangement Coordination no. = 12, `%` occupied space = `74%`
iii) bec: 68% space is occupied. Coordination no= 8 17.
The empty space left in hcp in three dimensions is

A

`26%`

B

`74%`

C

`52.4%`

D

`80%`

Text Solution

Verified by Experts

The correct Answer is:
A

HCP P.F `=pi/(3sqrt(2)) = 0.74 , V.F = 0.26 = 26%`
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