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Crystalline and Amorphous Solid

1) How cubic ...

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1) How cubic close packing is fcc and the structure is almost similar to hcp then why its cubic close packing? 2) In octahedral voids, there are 6 spheres surrounding the void then why its called octahedral void?

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Q. How many octahedral voids are there in

1

mole of an element having cubic close packed structure?

Q. The number of octahedral voids in a unit cell of cubic close packed structure is:

Q. Assertion :A tetrahedral void is surrounded by four spheres and an octahedral void is surrounded by six spheres. Reason: The number of tetrahedral voids is double the number of close packed spheres and number of octahedral voids is equal to number of close packed spheres.

Q. There are three cubic unit cells

A, B

C

A

F C C

and all of its tetrahedral voids are also occupied.

B

F C C

and all of its octahedral voids are also occupied.

C

is simple cubic and all of its cubic voids are also occupied. If voids in all unit cells are occupied by the spheres exactly at their limiting radius, the order of packing efficiency would be:

Q. Number of octahedral void(s) per atom present in a cubic closed packed structure is :

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