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The number of following pairs of elements which exhibit diagonal relationship is:
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$3$
Diagonal relationship is exhibited by an element and the element lying diagonally right to the next group in the next period.
$\mathrm{Li} \rightarrow \mathrm{Mg}, \mathrm{Be} \rightarrow \mathrm{Al}, \mathrm{B} \rightarrow \mathrm{Si}$.
$\mathrm{Li} \rightarrow \mathrm{Mg}, \mathrm{Be} \rightarrow \mathrm{Al}, \mathrm{B} \rightarrow \mathrm{Si}$.
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