why helium is known as Nobel gas
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1
Answer:
Coz it has completely filled outermost she'll so it does not react hence it's called Noble gas or inert gas......
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Explanation:
HELIUM IS CALLED NOBLE GAS BECAUSE IT DOESN'T REACT WITH ANYTHING.
IT HAS ZERO VALENCY AS IT IS A NOBLE GAS.
PLEASE MARK AS BRAINLIST HEARTILY
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