Question:
The set of elements that differ in mutual relationship from those of the other sets is :
Correct Option: , 4
Solution:
$\mathrm{Li}-\mathrm{Mg}, \mathrm{B}-\mathrm{Si}, \mathrm{Be}-\mathrm{A} 1$ show diagonal relationship but $\mathrm{Li}$ and $\mathrm{Na}$ do not show diagonal relationship as both belongs to same group and not placed diagonally.
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