Question

The edge length of a face centred cubic cell of an ionic substance is 508pm. If the radius of the cation is 110pm, find the radius of the anion?

Answer 1

Answer:

144 pm

Explanation:

For an fcc solid, edge length , a=2(r++r−)

⇒2(110+r−)=508

⇒220+2r−=508

⇒2r−=508−220

⇒2r−=288

∴r−=144pm