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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
Explain why $^3_1\text{H}\text{ and }^3_2\text{He}$ are not considered isotopes.
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Answer

$^{3}{\text{H}_1}\text{ and }^3\text{He}_2$ are not consideredas isotopes because they do not have same atomic number.

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