In which orbitals would the valence electrons for selenium Se be placed?

Selenium has 34 electrons, with electron configuration [Ar] 3d¹⁰ 4s² 4p⁴. Its valence electrons are in the outermost energy level, n = 4, which includes the 4s and 4p orbitals. Therefore, the valence electrons occupy s and p orbitals.

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