Hydrogen ions (H+) don't actually "split" into anything. They are already the simplest form of a hydrogen atom, consisting of just a single proton.

Here's what's happening:

* Hydrogen atom: A neutral hydrogen atom consists of one proton and one electron.

* Hydrogen ion: When a hydrogen atom loses its electron, it becomes a positively charged ion (H+). This is often called a proton, because it is essentially just a proton.

Key point: It's not that the hydrogen ion splits, but rather that the hydrogen atom *loses* its electron to become the ion.