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Which of the following is the pair of ...

Which of the following is the pair of shortest and longest periods in the modern periodic table ?

A

`1^(st),2^(nd)`

B

`2^(nd),3^(rd)`

C

`5^(th),7^(th)`

D

`1^(st),6^(th)`

Text Solution

Verified by Experts

The correct Answer is:
B
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