Question

Why helium is not reactive but hydrogen is reactive

Answer 1

Answer:

Noble gases are the least reactive of all known elements. That's because with eight valence electrons, their outer energy levels are full. The only exceptionis helium, which has just two electrons.

Answer 2

Answer:

Noble gases are the least reactive of all known elements. That's because with 8 valence electrons, their outer energy levels are full. The only exception is Helium, which has just 2 electrons.

Explanation:

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