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The f-block in period 6 corresponds to the lanthanoids (4f), with 14 elements (Ce to Lu).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
The sixth period (n=6) includes 6s, 4f, 5d, and 6p orbitals, accommodating 32 electrons, hence 32 elements (Cs to Rn).
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
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