Neet Solved Paper 2015 Question 18
Question: A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?
Options:
A) 40 pm
B) 127 pm
C) 80 pm
D) 108 pm
Show Answer
Answer:
Correct Answer: B
Solution:
- Given, edge length = 361 pm Four metal atoms in one unit cell i.e. effective number in unit cell (z) = 4 (given)
$ \therefore $ It is a FCC Structure
$ \therefore $ Face diagonal = 4r $ \sqrt{2}a=4r\Rightarrow r=\frac{\sqrt{2}+361}{4}=127pm $
