Transition and Inner Transition Elements — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryTransition and Inner Transition Elements2 Marks
Question
${ }_{63} EU$ and ${ }_{70} Yb$ show $2+$ oxidation state. Explain.
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Answer
${ }_{63} EU$ has electronic configuration, $[ Xe ] 4 f^7 5 d^{\circ} 6 s^2$. By losing 2 electrons from $6 s$ orbital, it acquires stable configuration and $4 f$-orbital is half-filled. $70 Yb$ has electronic configuration, $[ Xe ] 4 f ^{14} 5 d^{\circ} 6 s^2$. By losing 2 electrons from $6 s$ orbital, it acquires stable configuration and 4/-orbital is completely filled. Hence Eu and $Yb$ show $2+$ oxidation states.
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