Question

$\left(_{32}Ge^{76}, _{34}Se^{76}\right)$ and $\left(_{14}Si^{30}, _{16}S^{32}\right)$ are examples of

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

Answer 1

Answer: (B)

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