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Diagonal relationsgip is quite pronounce...

Diagonal relationsgip is quite pronounced in the elements of

A

`2^(nd)` & `3^(rd)` periods

B

`1^(st)` & `2^(nd)` periods

C

II & III groups

D

`3^(rd)` & `4^(th)` periods

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The correct Answer is:
A
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