A naturally occurring element consists of two isotopes. Calculate the average atomic mass and identify the element, based on the data below.
Isotope 1: 10.013 u 19.78 %
Isotope 2: 11.009 u ------% ,Hint: Percentages should always add up to 100% then find the weighted average.
A) 10.991 u, neon
B) 10.81 u, lithium
C) 10.81 u, boron
D) 11.01 u, carbon
E) 10.81 u, nitrogen
Correct Answer:
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