Oxygen ion has completely filled k and L shell explain
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oxygen has completely filled the K and L because it has become an anion and when it becomes anion to form a stable electronic configuration of its nearest noble gas i.e. Neon it has received 2 electrons thus resulting in completely filling of K and L shell......
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Explanation:
atomic no of oxygen is 8 so it's electron configuration is 2and 6but every element for stable it needs to complete it's octet so oxygen have 6valence electron not 8 so it is difficult to lose that six electrons to achieve inertness so oxygen gain 2electron to complete it's octet 6+2=8 so that's why it's valency is -2
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