Periodic Trend: Ranking Ionic Radii

Practice: Arrange the following atoms and/or ions in the order of increasing size: Br ^–, Kr, Rb⁺, Sr²⁺.

Practice: Arrange the following isoelectronic series in order of decreasing radius: F^–, O^2–, Mg²⁺, Na⁺.

Practice: For an isoelectronic series of ions, the ion that is the smallest is always