NEET 2009
- Exam
- NEET
- Year
- 2009
- Subject
- Chemistry
- Chapter
- Solid State
NEET 2009 · Chemistry · Solid State
Copper crystallizes in a face-centred cubic lattice with a unit...
Copper crystallizes in a face-centred cubic lattice with a unit cell length of . What is the radius of copper atom in pm?
Options
- A108
- B128
- C157
- D181
Correct answer
B. 128
Step-by-step solution
fcc lattice
\begin{aligned} &4 r=\sqrt{2} a\\ &\mathbf{r}=\frac{1}{2 \sqrt{2}} \mathbf{a}\\ &r=\frac{1}{2 \sqrt{2}} \times 361=128 \end{aligned}
\begin{aligned} &4 r=\sqrt{2} a\\ &\mathbf{r}=\frac{1}{2 \sqrt{2}} \mathbf{a}\\ &r=\frac{1}{2 \sqrt{2}} \times 361=128 \end{aligned}