Sodium metal crystllizes in a body centred cubic lattice with a unit cell edge of `4.29 Å`. The radius of sodium atom is approximately

Options

A. `5.72 Å`
B. `0.93 Å`
C. `1.86 Å`
D. `3.22 Å`

Answer

C

Explanation

For bcc, `r=sqrt(3)/4 a`
`r=sqrt(3)/4xx(4.29Å)=1.86Å`