Elements from group 18 have atoms with eight valence electrons except which element?

Question

Elements from group 18 have atoms with eight valence electrons except which element?

Answer 1

Only Helium does not have 8 valence electrons.  All the noble gases (i.e.: Ne, Ar, Kr, Xe, Rn) all have 8 valence electrons in its outer shell each, thus making them stable gases.  On the other hand, Helium (He) only has 2 valence electrons, which already completes its outer 1s shell.

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[Answer: He]

Answer 2

Yeah - what he said. He beat me to it.

Answer 3

argh!!

I was so ready to answer this question....freaking top contributors with their monitoring and fast typing skills