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Answer:
32
Explanation:
Principal quantum number=n=4
Maximum number of electrons:-
[tex]\\ \sf\longmapsto 2n^2[/tex]
[tex]\\ \sf\longmapsto 2(4)^2[/tex]
[tex]\\ \sf\longmapsto 2(16)[/tex]
[tex]\\ \sf\longmapsto 32[/tex]