Question

Find the edge length of bcc unit cell if radius of metal atom is 126 pm.

Options

• 2.91 × 10^–8 cm

• 4.52 × 10^–8 cm

• 3.50 × 10^–8 cm

• 6.30 × 10^–8 cm

Answer 1

2.91 × 10^–8 cm

Explanation:

For bcc unit cell, 4r = `sqrt3 a`

`therefore a = 4r/sqrt3`

`(4xx126)/1.732`

= 291 pm

= 291 × 10^–10 cm

= 2.91 × 10^–10 cm