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The Brainliest Answer!
its atomic no is 18
it is already stable
it is in 18th group of periodic table
they are less reactive
they undergo no chemical reaction
its valency is 0
it is a noble gas
it is derived from Greek which means 'lazy' or 'inactive'
2 5 2
Helium is a noble gas having one shell and it has2 electrons
0 0 0
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