The electronic configuration $3d^{10}4s^0$ is exhibited by which of the following ions?

Elements after atomic number $103$ have been discovered. If an element with atomic number $106$ is considered,which of the following electronic configurations will it possess?

The metal ion which does not form coloured compounds is

Addition of non-metals like $B$ and $C$ to the interstitial sites of a transition metal results in the metal becoming:

The valence shell electronic configuration of $Cr$ and $Cu$ atoms, respectively, are

$E^o$ for the conversion of $Ce^{+4}$ into $Ce^{+3}$ is $1.74 \ V$. It suggests that