Oxygen
Oxygen Oxygen is the most abundant element on earth. Oxygen is abbreviated with an “O” and has the atomic number, eight. There are eight protons, eight, neutrons, and eight electrons in oxygen. Oxygen has a density of 1. ... There are three isotopes for oxygen. One is oxygen-16 which accounts for 99.756 % of all the oxygen found in nature. Another isotope of oxygen is oxygen-17 which accounts for .039 % of all the oxygen found in nature.