Using Atomic mass and percent abundance, how do I determine which element this is?
Using Atomic mass and percent abundance, how do I determine which element this is?
I’m given three sets of information, the atomic mass and perecnt abundance, for three different naturally occuring isotopes of an unknown element. How do I determine which element it is?
Best answer:
Answer by Costa Freakin’
All you have to do is look at the periodic table. The atomic mass will be underneath the element symbol. To determine what the average atomic mass is of the element you are given (the average of all the atomic masses is actually the atomic mass that they put on the periodic table) multiply the mass given times the percent abundance. So the mass times .99 if they tell you it’s 99 percent. Once you have all those values, add them up and they will give you the average atomic mass given on the periodic table. It’s pretty simple, really.
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canadien,
You take the weighted average of all the isotopic masses for the element. For example, say the element has three isotopes, with the respective fractions of each isotope being F1, F2, and F3 (note — I said fraction, not percent — the fraction is the percent divided by 100, so that F1 + F2 + F3 = 1).
Then, take the isotopic mass of each isotope, say they are M1, M2, and M3. Take each isotopic mass, multiply it by its fractional abundance, and add them all up:
Atomic weight = F1M1 + F2M2 + F3M3 + …
That’s all there is to it! Hope that helps!