13.2 The three stable isotopes of neon: ${}_{10}^{20}{N e},$ ${}_{10}^{21}{N e}$ and ${}_{10}^{22}{N e}$ 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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Payal Gupta | Contributor-Level 10

7 months ago

13.2 Atomic mass of ${}_{10}^{20}{N e}$ neon isotope, $m_{1}$ = 19.99 u ad the abundance $η_{1}$ = 90.51 %

Atomic mass of ${}_{10}^{21}{N e}$ neon isotope, $m_{2}$ = 20.99 u ad the abundance $η_{2}$ = 0.27 %

Atomic mass of ${}_{10}^{22}{N e}$ neon isotope, $m_{3}$ = 21.99 u ad the abundance $η_{3}$ = 9.22 %

The average atomic mass of neon is given as:

m = $\frac{m_{1} η_{1} + m_{2 η_{2}} + m_{3} η_{3}}{η_{1} + η_{2} + η_{3}}$ = $\frac{19.99 * 90.51 + 20.99 * 0.27 + 21.99 * 9.22}{90.51 + 0.27 + 9.22}$ = $\frac{2017.71}{100}$ = 20.1771 u

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13.2 The three stable isotopes of neon: Ne1020, Ne1021 and Ne1022 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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13.2 The three stable isotopes of neon: ${}_{10}^{20}{N e},$ ${}_{10}^{21}{N e}$ and ${}_{10}^{22}{N e}$ 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.