The atomic size decreases with an increase in atomic number for the elements of the ........

Which of the following elements belongs to the inner transition elements?

Which pair of actinides exhibit the highest oxidation state of $+7$?

Name the members of the lanthanoid series which exhibit $+4$ oxidation state and those which exhibit $+2$ oxidation state. Try to correlate this type of behavior with the electronic configurations of these elements.

Which of the following elements are included in the actinoid series?

The percentage of lanthanides and iron,respectively,in misch metal are