What are f-block elements? How many series are there? Why they are called f-block elements?

What are f-block elements? How many series are there? Why they are cal

1.	What are f-block elements? How many series are there? Why they are called f-block elements?
Answer» SOLUTION :• The elements, WHOSE LAST electron enters into the f-orbital of the ante-penultimate shell (n-2) are having similar properties are called f-block elements. In these elements (n 2)f orbitas are being FILLED progressively. • The TWO rows of elements placed at the bottom of the neriodic table. They are lanthanid and actinides.