[Xe] 4f⁴ 6s²

Here's a breakdown:

* [Xe] represents the electron configuration of Xenon, which is the noble gas preceding Neodymium. This is a shorthand notation to avoid writing out all the filled orbitals.

* 4f⁴ indicates that there are four electrons in the 4f subshell.

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

Important note: This is the ground state electron configuration. There are also excited state configurations possible.