Solved UPSC CDS/OTA Question
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Q · Classification of Elements Easy · 45s
Which block contains elements whose valence electrons enter d-orbitals?
TopicClassification of Elements
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Transition (d-block) elements have valence electrons in (n-1)d orbitals.
Final Answer: Option C - d-block