Which of the following order is correct for the size of +, Fe, and +? — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

A decrease in the number of electrons for the same number of protons increases the effective nuclear charge on the outermost electrons. The higher the effective nuclear charge, the smaller will be the ionic size. Therefore, the correct order of size is + 3 + 2 Fe 63pm < Fe 77pm < Fe 126pm .