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Atomic Structure and Chemical Bonding — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtomic Structure and Chemical Bonding1 Mark
Question
Explain why $3 \mathrm{He}_2$ and $3 \mathrm{H}_1$ are not considered as isotopes.
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Answer

$3 \mathrm{He}_2$ and $3 \mathrm{H}_1$ are not considered isotopes because they have different atomic number but isotopes have same atomic number and different mass number

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