Which one of the following is not a transition metal?

Why is the $E^{\Theta }$ value for the $Mn^{3+}/Mn^{2+}$ couple much more positive than that for $Cr^{3+}/Cr^{2+}$ or $Fe^{3+}/Fe^{2+}$? Explain.

Explain the exceptions in the general electronic configuration of $3d$-series elements.

Permanent magnets are made from:

Which element from the following does $NOT$ exhibit a magnetic moment in the $+2$ oxidation state?

Which of the following options represents the correct order of basic strength for the given metallic hydroxides?