Chemistry I-Honors

atomic weight – This is not a weight! It is the weighted average of the atomic masses for all isotopes of an element. This is why the atomic weight of carbon is 12.011 and not 12.00. (Most carbon is C12 , however about 1.1% of naturally occurring carbon is C13) amu – atomic mass unit approximately equal to the mass of a proton or a neutron. ................
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