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Question

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

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

A

7.20 Å

B

1.80 Å

C

1.27 Å

D

2.90 Å

Answer

1.27 Å

Explanation

Solution

Atomic radius for fcc crystal is r = a22\frac{a}{2\sqrt{2}} = 3.622A˚\frac{3.6}{2\sqrt{2}}Å = 1.27 Å