question_answer 1)

Consider the fallowing species: \[{{N}^{3-}},{{O}^{2-}},{{F}^{-}},N{{a}^{+}},M{{g}^{2+}}\] and \[A{{l}^{3+}}\] (a) What is common in them? (b) Arrange them in order of increasing ionic radii.

Answer:

(a) All have same number of electrons, i.e. they are isoelectronic species. (b) Radii of isoelectronic species increase with decrease in nuclear charge, i.e., atomic number. \[A{{l}^{3+}}