Solved UPSC CDS/OTA Question
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Q · Classification of Elements Easy · 45s
How many periods are in the modern periodic table?
TopicClassification of Elements
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained - no skipped algebra.
The table has seven horizontal rows called periods.
Final Answer: Option A - 7