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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 4 of 49
Marks: +1, -0
To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements? Illustrate your answer with examples.
Solution:  
Sc3+ has stable electronic configuration (vacant d-orbital), therefore Sc3+ is more stable than Sc+.
Fe3+ is more stable than Fe2+ due to half filled d-orbitals.
Mn2+ is more stable than Mn3+ due to half filled d-orbitals.
V5+ is more stable (due to vacant d-orbital) than V3+.
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