Natural abundance is the prevalence of different isotopes of an element as found in Earth naturally. The relative atomic mass (a weighted average) of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an isotope varies from planet to planet but remains relatively constant in time.I hope this helps.
L_n_C_fReAk
2006-12-10 18:16:56 UTC
relative abundace is natural abundance
Natural abundance is the prevalence of different isotopes of an element as found in Earth naturally. The relative atomic mass (a weighted average) of these isotopes is the atomic weight listed for the element in the periodic table. The abundance of an isotope varies from planet to planet but remains relatively constant in time.
As an example, uranium has 3 naturally accuring isotopes: U-238, U-235 and U-234. Their respective NA (natural abundance) is 99.2745%, 0.72% and 0.0055%, meaning that if, say, 100 000 uranium atoms were analysed, one whould expect to find aproximately 99 274 U-238 atoms, 720 U-235 atoms and finally no more than 5 or 6 U-234 atoms. This is not surprising as U-238 is much more stable than U-235 or U-234 (evident wile looking at the isotopes half-life: 4.468×109 years for 238U compared to 7.038×108 y for 235U and 245 500 y for 234U).
Bleed the Freak
2006-12-10 18:19:51 UTC
It means there is plenty of an object with in reason. such as there is a relative abundance of winter coats at the store there is not an endless supply but enough to sell and still have some in stock. A endless abundance would be so many coats that the store could not run out. It pretty much means there is enough to use and get the job done as long as something is not abused and used carelessly.
asdf77
2006-12-10 18:16:30 UTC
the number of organisms of a particular kind as a percentage of the total number of organisms of a given area or community