assertion: the electronic configuration of neon is 2,8,2 reason:each noble gas has eight electrons in its outermost shell ( except helium)
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Helium belongs to the 1st period of the periodic table and has an atomic number of two.
The two electron fills the 1s orbital and hence has completely filled valence shell.
That's why Helium is the only noble gas with 2 electrons in its valence shell.
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