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(i) Isotones: Those atomic species which have different atomic numbers and have different atomic mass number, but have same number of neutrons are known as Isotones. e.g. $$_{ 14 }^{ 30 }{ Si },\ _{ 15 }^{ 31 }{ P } \ and\ _{ 16 }^{ 32 }{ S }$$In these compounds number of neutrons I.e. (at mass number - atomic number) are same which is 16.$$ _{ 88 }^{ 226 }{ Ra } \ and \ _{ 89 }^{ 227 }{ Ac } $$Here the number of neutrons is 138.There these are isotones.
(ii) Relative Abundance: The proportion of diff. isotopes present in the bulk is known as Relative Abundance. For eg. Chlorine exist in the two isotopic form 35... 131 and 35But the proportion of the two isotopes present in the bulk are 35 and 37 are in 3:1. This proportion present in the bulk is known as Relative Abundance.
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