How does selenium obey octet rule?

Selenium, with an atomic number of 34, has six valence electrons in its outer shell. To obey the octet rule, it tends to gain or share two electrons to achieve a stable configuration of eight electrons in its outer shell. This can occur through covalent bonding, where selenium shares electrons with other atoms, or by forming anions, where it gains electrons. As a result, selenium commonly exhibits a -2 oxidation state in compounds, aligning with the octet rule.