Correct Answer - Option 2 : Isobars
Concept:-
Classification of nuclei:
The nuclei have been classified into isotopes, isobars, and isotones on the basis of the number of protons i.e. (atomic number) or the total number of nucleons i.e.(mass number).
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1.
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Isotopes
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- The elements having the same number of protons (atomic mass Z) but different numbers of neutrons (Mass number A).
- Examples:- 8O16, 8O17and 8O18
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2.
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Isobars
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- The elements having the same Mass number A but a different number of protons (atomic mass Z).
- Examples:- 1H3 and 2He3, 8O17 and 9F17
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3.
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Isotones
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- The elements having the same number of neutrons (A-Z).
- Examples:- 3Li3 and 4Be3, 1H3 and 2He4
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Explanation:-
According to the given statement of the question, Two nuclei are not identical which means two nuclei have a different atomic number but have the same number of nucleons(protons and neutrons) or the same mass number. So the given statement is nothing but the definition of Isobars.
Hence, option 2) Isobars is the correct answer to this question.
Additional point:-
Mass number:
- It measures the sum of the number of protons and neutrons combined to give us the mass number in the nucleus of a particular atom.
- The mass number is also known as Nucleon number and denoted by A.
Atomic number:
- It measures the number of protons present in the nucleus of a particular atom.
- The mass number is represented with Z.
