Solid State - Result Question 13

####13. A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ’ a ‘, the closest approach between two atoms in metallic crystal will be

(2017 Main)

(a) 2a

(b) 22a

(c) 2a

(d) a2

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Answer:

Correct Answer: 13. (d)

Solution:

  1. For fcc arrangement, 4r=2a

where, r= radius and a= edge length

Closest distance =2r=2a2=a2



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