NaCl has fcc structure becoz in NaCl ,Cl anions are present at all the eight corners and at all the six faces.
contribution due to Corner particles is 1/8X8=1
contribution due to face particles is 1/2X6=3
there fore total is equal 4 Cl anions
and Na cations are present at the body centre and centre of all the 12 edges
contribution due to body centre particle =1
contribution due to edge particle =1/4X12=3
total is equal to 4 Na cations
becoz of anionic arrangement it is called at fcc.
Moderation Team
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