Which pair of elements shows a diagonal relationship?

A $K$ and $Ba$
B $Be$ and $Mg$
C $Li$ and $Mg$
D $Na$ and $Ca$

Answer: C

Lithium (period 2, group 1) and magnesium (period 3, group 2) are diagonal neighbours with similar charge to radius ratio. Be and Mg are in the same group, and the other pairs are not diagonal neighbours.

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