What Is Relative Abundance?

Answer

Relative abundance is the abundance of a species (by any measure), divided by the total abundance of all species combined. Relative abundance has no units. Alternatively, relative abundances can be expressed as a percentage. You can find more information here: http://ordination.okstate.edu/abund.htm
Q&A Related to "What Is Relative Abundance"
The concentration of each isotope of a natural chemical element.
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The abundance of selenium: Se-74 is .89; Se-76 is 9.36; Se-77 is 7.63;
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1. Consult the periodic table to determine the atomic mass of the element whose isotopes you are measuring. You also need to know the atomic mass of each isotope being measured. 2
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126.6331x is the contribution the light isotope makes to the overall atomic weight. The remaining fraction (1-x) therefore contributes 129.1386(1-x) to the atomic weight which we
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