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The three stable isotopes of neon Ne^20,...

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

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Average atomic mass of neon.
`A_"neon"=(x_1A_1+x_2A_2+x_3A_3)/(x_1+x_2+x_3)`
`=(90.51xx19.99+0.27xx20.99+9.22xx21.99)/100`
`=(1809.29+5.67+202.75)/100`=20.184
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