Atomic Structure. What Is An Atom?. the smallest particle of an element that retains the chemical properties of that element Can be subdivided into electrons (e - ), protons (p + ) and neutrons (n 0 ). Diagram Of An Atom. Important Info About Subatomic Particles.
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1 amu = (1/12)(mass of C-12 isotope in kg)
1 amu = 1.660540 x 10-27 kg
Amu = atomic mass units
Radioactive, Prepared Artifically
H-1 is 99.985% abundant with an atomic mass of 1.007825 amu
H-2 is .015% abundant with an atomic mass of 2.016490 amu
H-3 is not counted because of the fact that it is not naturally occurring
To find the weighted average:
(% abundance/100)(relative atomic mass of isotope 1) +
(% abundance/100)(relative atomic mass of isotope 2) +
(% abundance/100)(relative atomic mass of isotope 3)…
*Mass # may be substituted for the relative atomic mass when given
(99.985%/100)(1.007825 amu) + (.015%/100)(2.016940 amu)
= 1.0079 amu