Question

The edge length of rock salt unit cubic cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

Answer 1

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

⇒2(110+r−)=508⇒2(110+r−)=508

⇒220+2r−=508⇒220+2r−=508

⇒2r−=508−220⇒2r−=508−220

⇒2r−=288⇒2r−=288

∴r−=144pm

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