Question

What are inner transition (f-block) elements? Give two examples.

Answer 1

We have to know that inner transition elements are elements where the last electrons go in the f-orbital. These elements are the members of group $3$ but they are separately described as f-block elements. The other name of f-block elements are inner transition elements.

Complete answer:
F block components are separated into two orbitals, to be specific lanthanoids and actinoids. These blocks of components are frequently alluded to as inner transition metals since they give a change in the sixth and seventh column of the occasional table that isolates the s block and the d block components.
Components whose f orbital gets filled by electrons are called f block components. These components have electrons, $\left( {1 - 14} \right)$ in the f orbital, $\left( {0 - 1} \right)$ in the d orbital of the penultimate energy level and in the outer orbital.
There are two orbitals in the f block compared to the filling up of 4f and 5f orbitals. The components are 4f orbitals of $Ce$ to $Lu$ and 5f orbitals of $Th$ to $Lw$. There are $14$ components filling up the 'f' orbital in every orbital.
F block components are put independently at the lower part of the periodic table. They are a subset of sixth and seventh periods.
The components having a place with the f block are additionally separated into:
The main series of components are called lanthanides and incorporate components with atomic numbers starting from $57$ and finishing at $71$. These components are non-radioactive (aside from promethium, which is radioactive).
The second series of components are called actinides and incorporate components with atomic numbers starting from $89$ and finishing at $103$. These components by and large have a radioactive nature.
Since the f orbital lies much inside than d orbital, comparable to the transition metals naming, f block components are called inner transition series.
The two examples of inner transition elements are samarium and lutetium.

Note:
We have to know that some of the applications of inner transition elements are used in preparation of nuclear weapons, generating nuclear power plants, and some of the Lanthanides are used to prepare lasers. They are used to prepare strong magnets and also to make sunglasses.