1 Both Helium element beryllium have two electrons in valence shell .helium is a noble gas where as beryllium is a metal justify
2 There are two elements A(atomic no-13,mass no-26)and B (atomic no -14,mass no26) find their subatomic particles what is the relation between them
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1 ... because helium completes it's octet.
Noormalhotra:
Its duplet..in case of helium
oh yeah ... i am so sorry for the mistake
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