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Why Eu and Yb shows +2 oxidation state ?...

Why Eu and Yb shows +2 oxidation state ?

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To attain half filled and completely filled orbitals.
`Eu^(2+) rarr [Xe] 4f^7` (half filled orbitals)
`Yb^(2+) rarr [Xe]4f^(14)` (completely filled orbitals)
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