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Both helium and beryllium have two electrons in the valency shells. Helium is a noble gas where as beryllium is a metal. justify?

Yes you are that, He has 2 electrons in the valence shells, it has its complete valence shell so, inert gas. But Be has 4 e- in total 2 e- in K and 2 in L shell. But L shell can accommodate 8 electrons in all . Hence it needs 6 more electrons to complete it valence shell. Thus, not an inert element.

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Helium has only 2 electrons in its valence shell, also the capacity of K shell is 2. So It is a noble gas,
But beryllium on the other hand has 4 electrons 2 in K shell and 2 in L shell. The maximum capacity of the L shell is 8. But it has only two electrons in it. So it's valency is 2 and thus it is a metal.
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