[Xe] 4f³ 6s²

Here's how we arrive at this configuration:

* [Xe] represents the electron configuration of Xenon, which is the previous noble gas. This is a shorthand way to indicate the filling of the inner shells.

* 4f³ indicates that there are 3 electrons in the 4f subshell.

* 6s² indicates that there are 2 electrons in the 6s subshell.

Note: The 4f subshell is filled before the 5d subshell in Praseodymium, as it has a lower energy level.