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Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen's valence electrons as 2s²2p⁴. Created by Sal Khan.The electron configuration of livermorium is 5f 14 6d 10 7s 2 7p 4, if the electron arrangement is through orbitals. Electron configuration can be done in two ways. Electron configuration through orbit (Bohr principle) Electron configuration through orbital (Aufbau principle)