Urban Dictionary: The weighted average of the atmoic masses of the naturally occuring isotopes of an element

1.	average atomic mass
	The weighted average of the atmoic masses of the naturally occuring isotopes of an element. Suppose you had a box of marbles that contain 2 sizes of marbles. If 25% of the marbles have the massses of 2.00g each and 75% have the masses of 3.00g each then the average atomic mass would look like this. (25 marbles x 2.00g = 50g)+(75 marbles x 3.00g = 225g) = 275g / 100 = (an average atomic mass of) 2.75g. buy average atomic mass mugs & shirts average atomic mass average mass atomic mass atomic masss mass of an isotope by Killa Chris the Great Sep 28, 2006 add a video