Coordination number of a particle in the fcc structure (silver)

The same question, asked 3 times: 9 May 2023 S2, 11 Apr 2026 S2, 16 Apr 2026 S2. Every wording below, oldest first.

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Question 1
9 May 2023 S2
82 $What is the coordination number of a particle in fcc structure?$
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Question 2
11 Apr 2026 S2
20 $What is the number of neighbouring spheres for any particle in the fcc crystal lattice ?$
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Question 3
16 Apr 2026 S2
22 $What is the coordination number of Ag in a crystal lattice?$
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