In diamond structure ,carbon atoms form fcc lattic and `50%` tetrahedral voids occupied by carbon atoms . Energy carbon atoms is surrounded tetrahedral by four carbon atom with bond length 154 pm . Germanium , silicon and grey tin also crystallise in same way as diamond `(N_(A)=6xx 10^(23))`
The side length of diamond unit cell is `("in pm")`:

Options

A. 154
B. 1422.63
C. 711.32
D. 355.66

Answer

D