A hypothetical atom is known to be isotonic with the nuclide . Calculate the exact mass number () of — Nuclear Chemistry and Radioactivity Chemistry Question
Question
A hypothetical atom ${}_{8}^{x}X$ is known to be isotonic with the nuclide ${}_{9}^{17}Y$. Calculate the exact mass number ($x$) of atom X.
Answer: B
💡 Solution & Explanation
Number of neutrons in ${}_{9}^{17}Y$ is $17 - 9 = 8$. For atom X to be isotonic, it must also contain 8 neutrons. Its mass number $x = \text{protons} + \text{neutrons} = 8 + 8 = 16$.
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