Question

1. Explain why He and H are not considered isotopes.​

Answer 1

Answer:

The atoms of 1,3 hydrogen atom and helium 1,3 atoms are not considered pair of isotopes.An isotopic pair have same atomic number and different mass due to different number of electrons. But in this case the atomic mass is same but atomic number is different.

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Answer 2

Answer:

in this case an isotopic pair have same atomic number and different masses due to different number of electrons . but in this case the atomic mass is same but atomic number is different

Explanation:

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