the edge length of fcc is 508 pm | Dofollow Social Bookmarking Sites 2016
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For FCC lattice (assuming cation in octahedral void and anion in FCC)a = 508 pm (r+ + r-) = a/2 = 508/2 = 254 pm(r+ + r-) = 254 pmr- = 254-110 = 144 pm