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select the point of isotones from the...

select the point of isotones from the following nuclei `""._(12)Mg^(24),""._(1)H^(3),""._(2)He^(4),""._(11)Na^(23)`.

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`(i) ""_1H^3 and ""_2He^4`
Number of neutrons = 3-1 or 4-2
=2
(ii) `""_(12)Mg^(24) and ""_(11)Na^(23)`
Number of neutrons =24-12 or 23-11
=12
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