What is the electron configuration, orbital diagram, and noble gas notation of potassium?

Potassium's is 19. This means that every atom of potassium has 19 protons in its nucleus. In a neutral atom, the number of protons is equal to the number of electrons. So the of potassium will involve 19 electrons.

The full electron configuration of potassium is ##"1s"^2"2s"^2"2p"^6"3s"^2"3p"^6"4s"^1"##.

The noble gas notation is ##"[Ar]4s"^1"##.

The following orbital diagram shows the increase in energy from one energy sublevel to the next, but you can write them on the same level horizontally,