Question

Element $Hg$ has two oxidation states $H{g}^{1+}$ & $H{g}^{2+}$, the correct order of radii of these ions?

• A. $H{g}^{+1}<H{g}^{2+}$
• B. $H{g}^{1+}>H{g}^{2+}$
• C. $H{g}^{1+}=H{g}^{2+}$
• D. $H{g}^{1+}\le H{g}^{2+}$

Answer 1

The correct option is B $H{g}^{1+}>H{g}^{2+}$

The Cation with the greater positive charge will have a smaller radius because of the greater attraction of the electrons to the nucleus.
Therefore, correct order is: $H{g}^{1+}>H{g}^{2+}$