Here's why:

* Hydrogen has only one proton and one electron. This means it has only one electron to fill its orbitals.

* The 2p subshell has three orbitals: p_x, p_y, and p_z.

* Each orbital can hold up to two electrons.

* Hydrogen's electron fills only one of the 2p orbitals. It doesn't have enough electrons to fill all three.

Therefore, hydrogen has only one 2p state, even though the 2p subshell has three orbitals.