What is the coordination number of atoms in a face-centered cubic (FCC) structur

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Question: What is the coordination number of atoms in a face-centered cubic (FCC) structure? (2021)

Options:

Correct Answer: 12

Exam Year: 2021

Solution:

In a face-centered cubic (FCC) structure, each atom is in contact with 12 other atoms, giving it a coordination number of 12.

What is the coordination number of atoms in a face-centered cubic (FCC) structure? (2021)

What is the coordination number of atoms in a face-centered cubic (FCC) structure? (2021)

Step 1: Understand what a face-centered cubic (FCC) structure is. It is a type of crystal structure where atoms are arranged in a cube shape.
Step 2: In an FCC structure, there are atoms located at each corner of the cube and one atom at the center of each face of the cube.
Step 3: Count how many atoms each atom in the FCC structure is in contact with. Each corner atom touches 4 face atoms and each face atom touches 4 corner atoms.
Step 4: Realize that each atom in the FCC structure is surrounded by 12 other atoms.
Step 5: Conclude that the coordination number, which is the number of atoms an atom is in contact with, is 12 for the FCC structure.

Coordination Number – The coordination number refers to the number of nearest neighbor atoms surrounding a central atom in a crystal structure.
Face-Centered Cubic Structure – A face-centered cubic (FCC) structure is a type of crystal lattice where atoms are located at each of the corners and the centers of all the cube faces.