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JEE Main 2002
Exam
JEE Main
Year
2002
Subject
Chemistry
Chapter
Solid State

JEE Main 2002 · Chemistry · Solid State

Na and Mg crystallize in BCC and FCC type crystals respectively,...

Na and Mg crystallize in BCC and FCC type crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystal is

Options

  1. A4 and 2
  2. B9 and 14
  3. C14 and 9
  4. D2 and 4

Correct answer

D. 2 and 4

Step-by-step solution

BCC - points are at corners and one in the centre of the unit cell Number of atoms per unit cell =8×18+1=2=8 \times \frac{1}{8}+1=2 FCC - points are at the corners and also centre of the six faces of each cell Number of atoms per unit cell =8×18+6×12=4=8 \times \frac{1}{8}+6 \times \frac{1}{2}=4
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