1.

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

Answer»

`(._1^2H, ._1^3H),(._79^197Au, ._80^198Hg) and (._2^3He, ._1^2H)`
`(._2^3H, ._1^1H),(._79^197Au, ._80^198Hg) and (._1^1He, ._1^3H)`
`(._2^3H, ._1^3H),(._1^2H, ._1^2H) and( ._79^197Au, ._80^198Hg)`
`(._1^2H, ._1^3H),(._2^3He, ._1^3H) and( ._79^197Au, ._80^198Hg)`

Solution :Nuclides with same ATOMIC number Z but different mass number A are KNOWN as isotopes. Nuclides with same mass number A but differentatomic number Z are known as isobars.Nuclides with same NEUTRON number N=(A-Z) but different atomic number Z are known as ISOTONES.
`._1H^2` and `._1H^3` are isotopes
`._2He^3` and `._1H^3` are isobars.
`._79Au^197` and `._80Hg^198` are isotones.


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