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Q.

Total number of elements of 6th and 7th period which have been placed outside the periodic table is 

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a

28

b

14

c

32

d

18

answer is D.

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Detailed Solution

14 Lanthanoids and 14 actinoids have been placed outside the periodic table. The total is 28.

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Total number of elements of 6th and 7th period which have been placed outside the periodic table is