Question

Lithium crystallizes in a body centred cubic lattice,
how many next nearest neighbours does each Li
has?
(1) 8
(3) 12
(4) 4
(2) 6
correct answer is option (2) 6...plz explain properly how​

Answer 1

In bcc lattice the corner atoms are called as the nearest neighbours and also a bcc structure has 8 corners atoms, so the Lithium atom will have 8 nearest neighbours.

Second nearest neighbors are the neighbors of the first neighbors. So for BCC let's consider the atom at the body centre, for this atom the atom at the corner are nearest and for the atoms at the corners the atom at body centres of other cubes are nearest. Little imagination(there are 6 body centred atoms surrounding the atom we are considering) and counting gives the answer as six...

first neighbours are 8

and second are 6..

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