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What is diagonal relationship? What are its main causes?

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In addition to horizontal and vertical trends in a periodic table; there is a diagonal relationship between certain sets of elements (Li and Mg, Be and Al, B and Si) that have upper left/lower right relative location in the periodic table. These pairs of elements share similar size and electronegativity, resulting in similar properties. Diagonal relationship is due to the increase in the charge in the ion and decrease in the size of ion as we move along the period.

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