Question

Metallic gold crystallises in face centered cubic. Lattice with edge-length 4.070 Å. Closest distance between gold atoms is :

• A. 2.035 Å
• B. 8.140 Å
• C. 2.878 Å
• D. 1.357 Å

Answer 1

Answer: (C)

2.878 Å

Answer 2

Closest distance is = $\frac{a\sqrt{2}}{4}$=$\frac{4.070 \times \sqrt{2}}{2}$ Å = 2.878 Å