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I am little confused on how He can have 8 Valence electrons, or is He an exception in that group??
He is the exception to the rule. It doesnt have 8 valence electrons because it only has 2 electrons total so therefore it only has 2 valence electrons and is still a noble or inert gas.
they're not really "valence" electrons though,
they're "core" electrons -
He ain't even gonna give 'em up to form valence bonds -
it has a valency of big fat ZERO
but if you look at the lewis symbol for He it is He: and it only has two electrons which means that sublevel s is its outermost shell (valence shell) and the last and only two electrons it has are its valence electrons
the definition of valence electron is the electrons in the outermost main energy level and since it only has one the logical conclusion is that they are its valence electrons
well we can have silly arguments about terminology all day,
but helium doesn't care about what we call it -
it still won't form any compounds!
WebElements: the periodic table on the WWW [http://www.webelements.com/]