Solved UPSC CDS/OTA Question
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Q · Classification of Elements Easy · 45s
Who first proposed a periodic arrangement that evolved into today’s table?
TopicClassification of Elements
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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Mendeleev’s 1869 table arranged elements by atomic mass and predicted new ones.
Final Answer: Option B - Dmitri Mendeleev