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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)`._12Mg^24` and `._11Na^23`
Number of neutrons=24-12 or 23-11 =12
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