What are f-block elements? how many series are there? Why they are called f-block elements?
Answer»
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 orbitals are being filled progressively.
The two rows of elements placed at the bottom of the periodic table. They are lanthanides and actinides.