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The three stable isotopes of neon : .(10...

The three stable isotopes of neon : `._(10)^(20)Ne, ._(10)^(21)Ne` and `._(10)^(22)Ne` have respective abundance of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of Neon.

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20.18 u
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