What is the maximum possible value of the angular momentum for an outer electron in the ground state of a germanium atom?

What is the maximum possible value of the angular momentum for an outer electron in the ground state of a germanium atom?

The answer is 3.65e-34 kg · m2/s

Can someone please explain this to me very thouroghly because I am so confused as to how to do this question and every one I have seen posted on chegg has been answered incorrectly.

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