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how come radius of cation + radius of anion = edge length by 2 in case of face centered closed packing

how come radius of cation + radius of anion = edge length by 2 in case of face centered closed packing

Grade:12

1 Answers

Aman Bansal
592 Points
12 years ago

Dear Ria,

There are two types of closest packing, the hexagonal and the face-centered closest packing, and they are called hcp and fcc (or ccp) respectively. The hcp packing has an ABABAB... two-layer sequence, where A and B represent the location of the layers. In other word, the third layer is exactly above the first layer in hcp. The fcc packing has a three-layer sequence, ABCABC... rather than the two-layer sequence of the hcp. The two types of packing are shown below:

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