Use the periodic table to correctly describe the arrangement of electrons in an oxygen atom. Check all of the boxes that apply.

Oxygen has 8 electrons. Filling the orbitals in order gives 1s² 2s² 2p⁴, so choice B is correct. Its outermost shell is the second shell, which contains the 2s and 2p electrons; these are the valence electrons, so choice E is correct.

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