Question

Sodium metal crystallises in body centred cubic lattic with cell edge `4.29 Å` .What is the radius of sodium atom ?
A. `1.857 xx 10^(-8) cm`
B. `2371 xx 10^(-7) cm`
C. `3.817 xx 10^(-8) cm`
D. `9312 xx 10^(-7) cm`

Answer 1

Correct Answer - a
Radius of `Na` (if hcc lattice)
`= (sqrt(3)a)/(4) = (sqrt(3) xx 4.29)/(4)`
`= 1.8574 Å = 1.874 xx 10(-8)` pm