Physics · Composition and size of nucleus, atomic masses, mass-energy relation, mass defect
Naturally occurring argon (Ar) consists of three isotopes the atoms of which occ
Naturally occurring argon (Ar) consists of three isotopes the atoms of which occur in the abundances as given in the table The atomic weight of argon is: Isotopes Abundance \( ^{36} A r \) 0.34\% \( ^{38} A r \) 0.07\% \( \begin{array}{ll}40 & \text { 99.59\% }\end{array} \)
- A. 38.45 u
- B. 37.20
- C. 39.98 и
- D. 40.98 u
Step-by-step solution
The atomic weight is the weighted average of isotopic masses. Using approximate masses 36, 38, 40 u and abundances 0.34%, 0.07%, 99.59% gives (36×0.34 + 38×0.07 + 40×99.59)/100 = 39.98 u.
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