Diatomic oxygen is the second most abundant element in Earth's atmosphere after diatomic nitrogen. By volume dry air consists of 78.08%  nitrogen and 20.94% oxygen. The rest of it consists of Argon, carbon dioxide, Neon and Methane etc.

How many valence electrons are in oxygen?

The electronic configuration of Nitrogen is 1s2, 2s2, 2p4. There are 6 electrons in the valence shell of Oxygen. the Oxidation states of Oxygen may be −2, −1, 0, +1, +2 depending on the electronegativity of the bonding atom. The electronegativity of Oxygen is 3.44 (Pauling scale).

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How many neutrons does oxygen have?

Oxygen atomic number is 8. It has 8 electrons, 8 protons and 8 neutrons in an electrically neutral atom. But the number of neutrons is different in different isotopes of Oxygen. For example, there are three naturally occurring stable isotopes of oxygen. Oxygen-16 has an abundance of 99.76% and has 8 neutrons in the nuclide. Another isotope oxygen-17 has an abundance of 0.04% which has 9 neutrons. The last stable Oxygen-18 has 10 neutrons and an abundance of 0.20%.