explain
(1)Heliom atom has2einte valoncysheel but it's valenceis not 2
(2)Nucleus is verysmallas compared to the size ofatom.
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A) helium is a noble gas due to duplex configuration. All noble gases have valency zero.
Because they do not need to gain or lose electrons and also they do not combine with
other atoms
B) nucleus is a part of an atom. So it is smaller compared to atom
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