Void #2

U cud just imagine the spheres..........i cant explain exacty.....but there is no such expanation as such, i think

but as far as i know, there isnt any explanation.

So how did the relation come into existence???????

may b by imagination of the arrangement!

i think i can answer....there are n lattice points soooo....

octahedral voids are present on the edge centres and the body centre so effective no. of atom 12/4 + 1=4
for tetrahedral are present in body diagnols 2 in each sooo
effective no. =2*4=8
now the number of cubes be n soooo
4n and 8n

Thanx Sidharth[1] and thanx for your time and effort, bhaiyyah.