document.write( "Question 214603: Element QX has 3 naturally occurring isotopes. QX-18 occurs 72.03% of the time, Qx-17 occurs 22.94% of the time and Q-16 occurs 5.03% of the time. What is the average atomic mass number that would be reported on the periodic table?
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Algebra.Com's Answer #162060 by edjones(8007)\"\" \"About 
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18*.7203 + 17*.2294 + 16*.0503
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