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Both helium and beryllium have two electrons in the valence shell. helium is a noble gas whereas beryllium is a metal. justify



Helium 2....n beryllium2,2.... both hv 2 election in outer most shell bt the 2 electronz in helium satisfy the "K"shell bt beryllium hv 2 shellz namely K n L......the capacity of L shell s 8 so beryllium s nt noble gas....in order to gt octate configuration I.e 2,8 two electrons must be donated. since it has high donating capacity or electro negativity it s a metal

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