Question

Which is the isotone of ${}_{32}^{76}Ge$ ?

• A. ${}_{32}^{77}Ge$
• B. ${}_{34}^{78}Se$
• C. ${}_{36}^{79}Kr$
• D. ${}_{32}^{78}Ge$

Answer 1

Answer: (B)

${}_{34}^{78}Se$

Isotones are atoms containing the same number of neutrons (No. of $n=A-Z$). No. of neutrons in ${}_{32}^{76}Ge=76-32=44$. ${}_{34}^{78}Se$ has neutrons $=78-34=44$.