Answer
See explanation
Work Step by Step
a. $N^{+}, N, N^{-}$:
- Increasing radius: $N^{+} < N < N^{-}$
- Increasing ionization energy: $N^{-} < N < N^{+}$
b. Se, $Se^{-}$, Cl, $Cl^{+}$:
- Increasing radius: $Cl^{+} < Cl < Se < Se^{-}$
- Increasing ionization energy: $Se^{-} < Se < Cl < Cl^{+}$
c. $Br^{-}, Rb^{+}, Sr^{2+}$:
- Increasing radius: $Sr^{2+} < Rb^{+} < Br^{-}$
- Increasing ionization energy: $Br^{-} < Rb^{+} < Sr^{2+}$
