* The f-block consists of the Lanthanides (period 6) and Actinides (period 7). These elements have their valence electrons in the f-orbital, which can hold a maximum of 14 electrons.

* The number of electrons in an element's f-orbital varies. Each element within the f-block has a unique number of electrons in its f-orbital, ranging from 0 to 14.

For example:

* Lanthanum (La) has 0 electrons in its f-orbital.

* Cerium (Ce) has 2 electrons in its f-orbital.

* Lutetium (Lu) has 14 electrons in its f-orbital.

So, while the f-orbital itself can hold 14 electrons, individual f-block elements do not all have 10 electrons in their f-orbitals.