Answer is: 2-8-8-1, it means there are two electrons in first electrons shell (1s²), eight electrons in second (2s²2p⁶) and third (3s²3p⁶) electrons shell and one electron in fourth electrons shell (4s¹).
Potassium is a chemical element with atomic number 19 (number of electrons is 19).
Electron configuration of potassium is: ₁₉K 1s²2s²2p⁶3s²3p⁶4s¹.
Potassium is the alkali metal and has a single valence electron in the outer electron shell.
The complete ground state electron configuration for potassium would be written as 1s2 2s2 2p6 3s2 3p6 4s1. Electron configuration is the arrangement of the electrons of a molecule or an atom in the orbitals. These are key to understand the chemical properties exhibited by the elements.
