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Why is there a large increase in ion size from boron to nitrogen?
Wiki User
∙ 16y ago
Because Boron usually forms a cation, whereas Nitrogen usually forms an anion. Except for transition metals: The ionic radius of the atoms who usually form cations is always smaller than any of the ionic radii of the atoms who naturally form anions, because in forming a cation an atom loses an energy level and increases the total electrostatic force acting to pull the electrons towards the nucleus, whereas when an atom forms an anion it fills an energy level and increases the electrostatic force repelling the ectrons from the nucleus. The only exceptions to this rule for the known elements are Cs, Rb, and Ba ions. Cs ions are larger than N, O, and F ions , Rb ions are larger than O and F ions, and Ba ions are larger than F ions (by one picometer)
Wiki User
∙ 16y ago
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