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

Explanation

• 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.