What are f-block elements? Distinguish between lanthanoid and actinoid.

Explanation

f-block elements : The elements in which differentiating electron enters into (n - 2) f orbital or the penultimate shell or antepenultimate shell of the dorbital are called as f-block elements.
Difference between lanthanoids and actinoids
`{:("Lanthanoids","Actinoids"),(1."Differentiating electron enters in 4-f orbital",1. "Differentiating electron enters in 5-f orbital"),(2."Belongs to 6th period and form a part of third transition series",2."Belongs to 7th period and from a part of third transition series"),(3."Binding energy of 4-f orbital is higher",3."Binding energy of 4-f orbital is lower"),(4."only promethium is radioactive",4."All member are radioactive"),(5."Beside + oxidation state lanthanoids shows + 2 and + 4 oxidation state in few cases",5."Beside +3 oxidation state actinoids show +4, +5, + 7 higher oxidation state also"),(6."Lanthanoids show low tendency of form complexes",6."Actinoids show greater tendency to form complexes"),(7."Some of the ions of lanthanoids are fairely coloured",7."Most of the ions of actinoids are fairely coloured"),(8."Lanthanod hydroxides are less basic in nature",8."Actinoid hydroxides are more basic in nature"),(9."Contraction is relatively less",9."Contraction is greater"):}`