Highest $(+7)$ oxidation state is shown by

Statement-$I$: Mercury is liquid at room temperature.
Statement-$II$: In mercury,there is no unpaired $d$-electron and thus,metallic bonding is weakest.

Elements up to atomic number $103$ have been synthesized and studied. If a newly discovered element is found to have an atomic number $106,$ its electronic configuration will be

Consider the hydrated ions of $Ti^{2+}$,$V^{2+}$,$Ti^{3+}$,and $Sc^{3+}$. The correct order of their spin-only magnetic moments is

Among the following series of transition metal ions,the one where all metal ions have $3d^2$ electronic configuration is

Iron loses its magnetic property at: