What percentage of crystal space in fcc arrangement is vacant?

Q. What percentage of crystal space in fcc arrangement is vacant?

Q.

The percentage of empty space in a body centred cubic arrangement is ...............

(a) 74 (b) 68 (c) 32 (d) 26

Q. Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
(square pyramidal, electrical, 74, 26, $s{p}^3{d}^2$, $s{p}^{3}d$, chemical, 68, 32, tetrahedral, yellow, white, iodoform, Lucas)
The percentage of unoccupied spaces in bcc and fcc arrangements are __________ and __________ respectively.

Q. The percentage of free space in a face centered cubic (fcc) is :

Q. Argon crystallises in fcc arrangement and the density of solid and liquid $Ar$ is 1.59 $g/$ $c{m}^3$ and 1.42 $g/$ $c{m}^3$ , respectively . The percentage of empty space in liquid $Ar$ is: