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How many valence electrons in kr?

For the main group elements (Groups 1 2 13 – 18) the valence electrons for the atoms of an element are located in the outermost (highest energy) s and p sublevels.
The electron configuration of krypton is##[Ar]3d^104s^24p^6##. Krypton (Kr) has 8 valence electrons in the 4s and 4p sublevels which makes it very stable and nonreactive and this is why it is a noble gas.
Some would write the electron configuration as ##[Ar]4s^23d^104p^6##
Here is a video which discusses how to draw Lewis structures for atoms showing their number of valence electrons.

Video from: Noel Pauller
When atoms react they share gain or lose electrons in order to achieve an octet (8) of valence electrons except for hydrogen which reacts to get 2 valence electrons like helium the first noble gas. This gives the bonded atoms the electron configuration of a noble gas making them stable.

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