Question

If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal in Å is ______.

Options

• 7.20 Å

• 1.80 Å

• 1.27 Å

• 2.90 Å

Answer 1

If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal in Å is 1.27 Å.

Explanation:

The atomic radius for the fcc crystal is,

r = `a/(2sqrt2)`

= `3.6/(2sqrt2)`Å

= 1.27 Å