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Q.

The longest and shortest periods respectively are

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a

1 & 6

b

2 & 6

c

1 & 7

d

6 & 1

answer is C.

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Detailed Solution

In long form of the periodic table contains 7 periods 

In that 1st period → shortest period → it has two elements 6 th period → longest period → it has 32 elements.

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