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20 Answers
1for #4
i found same question in two different sources...............one says A and other C
1but for post 2 ans. is given as a
try other questions too!!!!!!
3hey wat do u think abt my suggestion.have i blabberd.pls tell me so that i can delete the post to avoid confusion.
3noo i think this diag will help u .
see the unit cell and the unit cell is formd by 14 atoms with some void.
106yes sankara: but does one corner atom lie completely in the unit cell?
3asish is not rite.he has calculated the the effective no of atoms in a unit cell.
Actually the qn is how many atoms were in the unit cell
106#2.
f-centres means there is electron present (free electrons) hence they are unpaired and hence paramagnetic
106#4:
In simple cubic, there are only 8 corner atoms whose contribution is 1/8 each (they are shared by 8 such adjacent unit cells)
Hence no. of atoms = 8*1/8 = 1
In fcc, there are 8 corner cells whose contribution is 1. The face centres are 6 which are shared by two unit cells hence there contribution is 6*1/2 = 3 so total = 4
In bcc, there are 8 corner cells whose contribution is 1. The body centre is shared by no other unit cell hence its contribution is 1. So no of atoms = 2
