Two atoms are defined as "isotones" if they possess the exact same number of neutrons. If a hypothetical atom is known to be isotonic with the nuclide , what is the mass number () of atom ?

Question

Two atoms are defined as "isotones" if they possess the exact same number of neutrons. If a hypothetical atom ${}_{8}^{x}X$ is known to be isotonic with the nuclide ${}_{9}^{17}Y$, what is the mass number ($x$) of atom $X$?

Prashant Kotian · Accepted Answer

Correct answer: 16. The number of neutrons in is . For atom to be isotonic, it must also contain 8 neutrons. Given its atomic number is 8, its mass number must be protons + neutrons = .

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