Both helium and beryllium have two valence electrons but helium is anoble gas element whereas beryllium doesnot . Give reason
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Both Helium and Beryllium have two valence electrons but helium is a noble gas element whereas beryllium does not. The reason is :
A noble gas is a gas which has stable electronic configuration also which has its octet and duet completed.
Helium's duet is completed that is why it is a noble gas but Beryllium's duet is not completed so it is not a noble gas.
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