What is the atomic structure of oxygen?

An oxygen atom has an atomic number of 8, indicating the presence of 8 protons in its nucleus. It usually also contains 8 neutrons and 8 electrons. These electrons are distributed in two shells: 2 in the K shell and 6 in the L shell, giving an electron configuration of 2,6. Because it needs two more electrons to complete its octet, oxygen is highly reactive and readily gains electrons to achieve stability.