A) \[{{(}_{1}}{{H}^{2}}{{,}_{1}}{{H}^{3}}),{{(}_{79}}A{{u}^{197}}{{,}_{80}}H{{g}^{198}})\]and\[{{(}_{2}}H{{e}^{3}}{{,}_{1}}{{H}^{2}})\]
B) \[{{(}_{2}}H{{e}^{3}}{{,}_{1}}{{H}^{2}}),{{(}_{79}}A{{u}^{197}}{{,}_{80}}H{{g}^{198}})\]and\[{{(}_{1}}{{H}^{1}}{{,}_{1}}{{H}^{3}})\]
C) \[{{(}_{2}}H{{e}^{3}}{{,}_{1}}{{H}^{3}}),{{(}_{1}}{{H}^{2}}{{,}_{1}}{{H}^{3}})\]and\[{{(}_{79}}A{{u}^{197}}{{,}_{80}}H{{g}^{198}})\]
D) \[{{(}_{1}}{{H}^{2}}{{,}_{1}}{{H}^{3}}),{{(}_{2}}H{{e}^{3}}{{,}_{1}}{{H}^{3}})\]and\[{{(}_{79}}A{{u}^{197}}{{,}_{80}}H{{g}^{198}})\]
E) \[{{(}_{1}}{{H}^{1}}{{,}_{1}}{{H}^{3}}),{{(}_{79}}A{{u}^{197}}{{,}_{80}}H{{g}^{198}})\]and\[{{(}_{2}}H{{e}^{3}}{{,}_{1}}{{H}^{3}})\]
Correct Answer: D
Solution :
(i) Isotopes of an element are nuclides having same atomic number Z but different mass number A. (ii) Nuclides having same mass number A but different atomic number Z are called isobars. (iii) Nuclides with different atomic number Z and different mass number A but same neutron number are called isotones. Thus, for isotones\[N=(A-Z)\]is constant. Hence, option (e) is correct.
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