Group 16 elements, also known as the oxygen group or chalcogens, have six valence electrons. These elements include oxygen (O), sulfur (S), selenium (Se), and tellurium (Te). The valence electron configuration of group 16 elements is often represented as ns²np⁴, where "n" represents the outermost energy level (shell) of the element. In this case, "n" can be any value from 2 onwards since group 16 elements are located in the third, fourth, fifth, and sixth periods of the periodic table.