Why Helium is considered as most unreactive element of the periodic table?
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helium atoms have two electrons in their outer energy level. that's why it is consider as most unreactive element
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Helium is one of noble gases in group 8 of the Periodic Table.
All these have a full outer electron shell.
The proton number of helium is two, so a helium atom has two electrons, which exist in the 1s shell.
It doesn't to gain or lose electrons to fill thus shell and is unreactive.
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