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Li/Mg, Be/Al and B/Si exhibit the so-called Diagonal Relationship. This is due to the fact that such pairs of diagonally adjacent elements in the second

Li/Mg, Be/Al and B/Si exhibit the so-called "Diagonal Relationship". This is due to the fact that such pairs of diagonally adjacent elements in the second and third periods of the Periodic Table have ______.

A. similar 1st Ionization Energy

B. the same oxidation numbers

C. similar charge density

D. the same valence shell electron configuration

E. similar size

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