Selenium is in group 16 and their outermost orbitals are ns2 np4. Hence the outermost orbitals of selenium are s orbital and p orbital.
An orbital refers to a region in space where there is a high probability of finding an electron. The valence electrons in an atom are contained in the outermost orbitals of the atom.
For selenium, the outermost orbitals are the s orbital and p orbital. These are the orbitals that contain the valence electrons. Recall that selenium is in group 16 and their outermost orbitals are ns2 np4.
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