The $3d-$ metal ions are paramagnetic in nature because

Which of the following substances is not paramagnetic?

Which one of the following has the maximum number of unpaired electrons?

The atomic number of an element is $26$. The element shows:

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following points:
$(i)$ electronic configurations,
$(ii)$ oxidation states,
$(iii)$ ionisation enthalpies,and
$(iv)$ atomic sizes.

Manganese is related to which block of the periodic table?