Which one of the following lanthanoids does not form MO2? [M is lanthanoid metal]
Solution
Nd (60) = 4f<sup>4</sup> 6s<sup>2</sup><br><br>
Pr (59) = 4f<sup>3</sup> 6s<sup>2</sup><br><br>
Dy (66) = 4f<sup>10</sup> 6s<sup>2</sup><br><br>
Yb (70) = 4f<sup>14</sup> 6s<sup>2</sup><br><br>
Yb<sup>+2</sup> has fully-filled 4f orbital, it will require very
large amount of energy to reach +4 oxidation
state.
About this question
Subject: Chemistry · Chapter: d and f Block Elements · Topic: Properties of Transition Metals
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