Q.

The number of periods and groups in the long form of periodic table are

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a

7 and 9

b

8 and 18

c

7 and 18

d

6 and 10

answer is C.

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Detailed Solution

s-2,p-6,d-10. f block is perpendicular to d-block.
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The number of periods and groups in the long form of periodic table are