Question

Rubidium iodide (molar mass 212.4 g/mol) has a face-centered cubic unit cell with rubidium ions in octahedral holes. If the radius of iodide ion is 219 pm and the density of RbI is 3.55 g/cm3, what is the radius of the rubidium ion (in pm)?
A.112 pm
B.149 pm
C.181 pm
D.297 pm
E.419 pm

Answer

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