The reasonable ground-state electron configuration would be [tex]1S^2,2S^2,2P^6[/tex]
According to the rules of electron configurations, lower energy level orbitals are filled before higher energy level orbitals.
Thus, the order of filling orbitals according to their energy levels would be: 1S, 2S, 2P, 3S, 3P. etc.
Also, there is a need to be conversant with the number of electrons each orbital can take. S can only take 2, and P can take a maximum of 6 electrons.
Thus, the only reasonable electron configuration would be [tex]1S^2,2S^2,2P^6[/tex]
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