WBCS.LIVE practice question

How many total constituent atoms effectively belong to a Face-Centered Cubic (FCC) unit cell?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 1
  2. 2
  3. 4
  4. 6

Correct answer and explanation

Correct answer: 4

Explanation: āœ… Correct Answer: C) 4 šŸ“š Explanation: In a Face-Centered Cubic (FCC) crystal lattice, atoms are located at all eight corners and at the centers of all six faces. The corner atoms contribute 1/8th each (8 Ɨ 1/8 = 1), and the face-centered atoms contribute 1/2 each (6 Ɨ 1/2 = 3). Therefore, the total effective number of atoms per FCC unit cell is 4.