1. Tardigrade
  2. Question
  3. Chemistry
  4. If atomic radius of barium is 2.176 mathringA and it crystallises in b.c.c. unit cell, the edge length of unit cell is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. If atomic radius of barium is $2.176\, \mathring{A}$ and it crystallises in b.c.c. unit cell, the edge length of unit cell is

The Solid State

Solution:

Cube diagonal,
$ 4r = \sqrt{3}a$
$a = \frac{4}{\sqrt{3}} r$
$ = \frac{4\times 2.176}{\sqrt{3}}\mathring{A}$
$ = 5.025 \,\mathring{A}$