Q. The set which represents the isotope, isobar and isotone respectively is
A) $\left( \ _{1}H^{2},\ _{1}H^{3} \right),(\ _{79}Au^{197},\ _{80}Hg^{198})$ and $(\ _{2}He^{3},\ _{1}H^{2})$
B) $\left( \ _{2}He^{3},\ _{1}H^{1} \right),(\ _{79}Au^{197},\ _{80}Hg^{198})$ and $\left( \ _{1}H^{1},\ _{1}H^{3} \right)$
C) $\left( \ _{2}He^{3},\ _{1}H^{3} \right),\left( \ _{1}H^{2},\ _{1}H^{3} \right)$ and $(\ _{79}Au^{197},\ _{80}Hg^{198})$
D) $\left( \ _{1}H^{2},\ _{1}H^{3} \right),\left( \ _{2}{He}^{3},\ _{1}H^{3} \right)$ and $(\ _{79}Au^{197},\ _{80}Hg^{198})$
Explanation
(d) Nuclides with same atomic number Z but different mass number A are known as isotopes
Nuclides with same mass number A but different atomic number Z are known as isobars
Nuclides with same neutron number $N = (A - Z)$ but different atomic number Z are known as isotones
$\ _{1}H^{2}$ and $\ _{1}H^{3}$ are isotopes
$\ _{2}He^{3}$ and $\ _{1}H^{3}$ are isobars
$\ _{79}Au^{197}$ and $\ _{80}Hg^{198}$ are isotones
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.