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WHY does it make sense that oxygen achieved full shell by gaining electron?
Wiki User
∙ 14y ago
It doesn't. Oxygen must gain (or borrow) two electrons to complete its outer shell since it has only 6 electrons in its valence shell.
Oxygen is atomic #8 in the Periodic Table, meaning it has 8 electrons. The first shell of an element needs only 2 electrons to be stable and relatively unreactive. Shells (energy levels) beyond the first need 8 electrons to be stable, but oxygen has only 6 left because 2 were used in the first shell. Therefore, oxygen needs 2 more to complete its outer (valence) shell.
Wiki User
∙ 14y ago
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