Question

The set which represents the isotope, isobar and isotone respectively is

• A. $\left({}_1^{2}H{,}_1^{3}H\right),\left({}_{79}^{197}Au{,}_{80}^{198}Hg\right)$ and $\left({}_2^{3}He{,}_1^{3}H\right)$
• B. $\left({}_2^{3}He{,}_1^{1}H\right),\left({}_{79}^{197}Au{,}_{80}^{198}Hg\right)$ and $\left({}_1^{1}H{,}_1^{3}H\right)$
• C. $\left({}_2^{3}He{,}_1^{3}H\right),\left({}_1^{2}H{,}_1^{3}H\right)$ and $\left({}_{79}^{197}Au{,}_{80}^{198}Hg\right)$
• D. $\left({}_1^{2}H{,}_1^{3}H\right),\left({}_2^{3}He{,}_1^{3}H\right)$ and $\left({}_{79}^{197}Au{,}_{80}^{198}Hg\right)$
• E. ${(}_1{H}^1{,}_1{H}^3),{(}_{79}A{u}^{197}{,}_{80}H{g}^{198})$ and ${(}_{2}H{e}^3{,}_1{H}^3)$

Answer 1

Answer: (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
${}_{2}H{e}^3$ and ${}_1{H}^3$ are isobars
${}_{79}A{u}^{197}$ and ${}_{80}H{g}^{198}$ are isotones