Question

Find the average atomic mass of Ne, whose isotopic abundance is as follows: 

²⁰Ne 0.9051; ²¹Ne 0.0027; ²²Ne 0.0922

Answer 1

Average atomic mass of Ne = (20 × 0.9051) + (21 × 0.0027) + (22 × 0.0922) = 20.1871 u.