1.

The edge length of a face-centered cubic cell of an ionic substance is 508 pm . If the radius of the cation is 110 pm , the radius (in pm) of the anion is:If it is face centered then should'nt we use root2 a = 2(r+ +r-) But the formula used is a=2r+ + 2r-why?

Answer» The edge length of a face-centered cubic cell of an ionic substance is 508 pm . If the radius of the cation is 110 pm , the radius (in pm) of the anion is:
If it is face centered then should'nt we use root2 a = 2(r+ +r-)
But the formula used is a=2r+ + 2r-
why?


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