cosmic abundance of elements

cosmic abundance of elements

In the universe as a whole, hydrogen is by far the commonest element followed by helium and more distantly by heavier elements such as oxygen and carbon. Locally, the proportion of heavy elements varies from one star system to another and is an influential factor in the formation of planets.


Number of atoms per 10,000,000 of hydrogen
hydrogen 10,000,000 sulfur 95
helium 1,400,000 iron 80
oxygen 6,800 argon 42
carbon 3,000 aluminum 19
neon 2,800 sodium 17
nitrogen 910 calcium 17
magnesium 290 all other elements 50
silicon 250