Atomic Radii Comparison of Atomic Radii with Ionic Slides: 7 Download presentation Atomic Radii Comparison of Atomic Radii with Ionic Radii Cation is always smaller than atom from which it is formed. Anion is always larger than atom from which it is formed. The Radii (in pm) of Ions of Familiar Elements Application of crystal field theoryGeochemistry definitionAtomic radius of elementsReference table of atomic radiiVfi atomic radiiAtomic radii periodic tableElectronegativity atomic sizeAtomic radius trend