No more than 2.
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1st shell: 2 electrons, 2nd shell: 8 electrons, 3rd shell: 8 electrons, 4th shell: 4 electrons, 5th shell: 0 electrons, 6th shell: 0 electrons.
The innermost shell of an atom can contain a maximum of 2 electrons.
The first orbital shell can hold a maximum of 2 electrons.
In the case of potassium, the M-shell does not have 8 electrons, rather it has 2 electrons. Potassium has 19 electrons in total, and they are distributed in different electron shells following the electron configuration principle. The M-shell can hold a maximum of 18 electrons, but it doesn't mean that it always has that many electrons.
Germanium, which has 32 electrons and protons, has 4 energy levels or electron shells. There are 2 electrons in the 1st shell, 8 in the 2nd shell, 18 in the 3rd shell and 4 in the 4th shell.