Based on the given outer electronic configurations,which element will exhibit the highest oxidation state?

The atomic radius of $Ag$ is closest to

Identify the transition element.

The correct option with the order of melting points of the pairs $(Mn, Fe)$, $(Tc, Ru)$ and $(Re, Os)$ is $:$

Which of the following elements in their respective oxidation states develops the highest spin-only magnetic moment?

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.