The highest oxidation state observed in first row transition metals is

Which of the following elements has the maximum density?

In the series $Sc (Z=21)$ to $Zn (Z=30)$,the enthalpy of atomisation of zinc is the lowest,i.e.,$126 \ kJ \ mol^{-1}$. Why?

Which of the following is expected to form a colourless complex?

What are the characteristics of the transition elements and why are they called transition elements? Which of the $d$-block elements may not be regarded as the transition elements?

Which of the following represents the correct order of atomic radii (metallic radii) for the given transition elements?