Oxygen-18
= Oxygen-18
{wiki=Oxygen-18}
Oxygen-18 (⁴O) is a stable isotope of oxygen that is characterized by having 8 protons and 10 neutrons in its nucleus. It is one of three naturally occurring isotopes of oxygen, the others being Oxygen-16 (⁴O) and Oxygen-17 (⁴O). Oxygen-18 is less abundant than Oxygen-16, making up about 0.2% of naturally occurring oxygen.