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Question

Which period is incomplete in the modern periodic table?
  1. 1st
  2. 2nd
  3. 6th
  4. 7th

A
1st
B
2nd
C
7th
D
6th
Solution
Verified by Toppr

The seventh period of the periodic table is incomplete as all the elements of this period are not yet discovered.

Hence, the correct option is D

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