The transition metal which shows oxidation states from $+2$ to $+7$ belongs to group:

The correct order of density for the $3d$ series elements is:

The maximum and minimum melting points of the first and second transition series elements,respectively,are obtained with $-$

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.

Which one of the following is correct for all elements from $Sc$ to $Cu$?

Which of the following is ferromagnetic in nature?