Question

$\left({}_{32}G{e}^{76}{,}_{34}S{e}^{76}\right)$ and $\left({}_{14}S{i}^{30}{,}_{16}{S}^{32}\right)$ are examples of

• A. isotopes and isobars
• B. isobars and isotones
• C. isotones and isotopes
• D. isobars and isotopes

Answer 1

Answer: (B)

${}_{32}G{e}^{76}$ and ${}_{34}S{e}^{76}$ have the same mass number but different atomic number, so they are isobars.
Number of neutrons,
in ${}_{14}S{i}^{30}=30-14=16$
in ${}_{16}{S}^{32}=32-16=16$
Because of the presence of same number of neutrons, ${}_{14}S{i}^{30}$ and ${}_{16}{S}^{32}$ are called isotones.