Usually oxygen atom has 8 electrons. Unless it's an ion where it picks up or loses electrons and carries a charge but usually eight. And here's proof: divide the atomic weight of oxygen (16) by 2 and...
Most atmospheric oxygen is in a diatomic state, as O2 (two atoms per molecule). However, the allotrope ozone or O3 has three atoms, and is highly oxidizing. High atmospheric concentrations of ozone,...