Solved UPSC CDS/OTA Question
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Q · Classification of Elements Medium · 45s
Helium is placed in Group 18 although it is an/a ___ element.
TopicClassification of Elements
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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He has a 1s² configuration but is grouped with the noble gases for its full shell.
Final Answer: Option A - s-block