Atoms and Molecules

Trends in Reactivity and the Periodic Table

Which elements are most abundant?

Element Abundance
(ppm atom fraction)
Hydrogen 909,964
Helium 88,714
Oxygen 477
Carbon 326
Nitrogen 102
Neon 100
Silicon 30
Magnesium 28
Iron 27
Sulfur 16

The Periodic Table of Elements.


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