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What are isotopes and isomers ?...

What are isotopes and isomers ?

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Isotones : The nuclei having same neutron number (N) but different atomic numbers (Z) are called isotones.
E.g. : `._(80)^(198)Hg, ._(79)^(197)Au`.
Isomers : Nuclei having the same atomic number (Z) and mass number (A) but with different nuclear properties such radioactive decay and magnetic moments are called isomers.
E.g. : `._(35)^(80)Br^(m), ._(35)^(80)Br^(g)`.
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    A
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    B
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    C
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    D
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