Helium atom has 2 electrons in its valence shell but it's valency is not 2 explain
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helium is a Nobel gas
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It's right that Helium has 2 valence shells , so a helium atom has only 1 shell which is completely filled , means a helium atom is stable and thus no need to react or combine with any other element . Due to its stability Helium atom exists independently.
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