Oxygen is a non-metal element and its symbol is O. The atomic number of oxygen is 8 and its atomic mass is 16. Oxygen belongs to 'p' period of periodic table. Oxygen element lies in 16th group and 2nd period of periodic table. The electrons in per shell of oxygen is 2 and 6. The electronic configuration of oxygen is 1s2 2s2 2p4. The numbers of electrons in outer most shell of oxygen is 6. So, the valence electrons in oxygen atom are 6. Two electrons are present in s-orbital and four electrons are present in p-orbital. Two electrons are required to complete outer most shell of the oxygen atom. So, the valency of oxygen atom is negative two.
6. As element # 8, it has eight total electrons when it is not an ion. The first shell takes two, and the next shell takes the remaining 6. Therefore, the outermost shell (the valence shell) contains 6 electrons.
Oxygen has six valence electron