alleryIn the modern periodic table, the sixth period (atomic numbers 55 to 86) contains how many elements?
A8 elements
B18 elements
C32 elements
D2 elements
Answer & Solution
Correct answer: C. 32 elements
1. The sixth period is the longest period in the table.
2. It runs from caesium (55) to radon (86).
3. It contains 8 representative + 10 transition + 14 inner transition = 32 elements.
The fourth and fifth periods have 18
only the sixth and seventh reach 32.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 8 Periodic Classification of Elements "Features of Periods", p.114_
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