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← JEE Main 2017 · 2 Apr · Shift 1
ChemistrySingle correct+4 / -1Question 35 of 90

JEE Main 2017 · 2 Apr · Shift 1, Chemistry question 35

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 :

Choose one option
Answer and worked solution

Official answer: B

In fcc the atoms touch along the face diagonal, 2a=4r\sqrt2a=4r. The closest approach is 2r=a22r=\dfrac a{\sqrt2}.