In a close- packed body- centred cubic l...

In a close- packed body- centred cubic lattice of potassium, the correct relation between the atomic radius (r) of potassium and the edge- length (a) of the cube is

`r=(a)/(sqrt(2))`

`r=(a)/(sqrt(3))`

`r=(sqrt(3))/(2)a`

`r=(sqrt(3))/(4)a`

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