Solved UPSC CDS/OTA Question
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Q · Classification of Elements Easy · 45s
Which group has elements with completely filled valence shells?
TopicClassification of Elements
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Noble gases (Group 18) possess stable ns² np⁶ configurations (He: 1s²).
Final Answer: Option D - Group 18