define diagonal relationship in reference of periodic table.
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A Diagonal Relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods of the periodic table. ... On crossing a period of the periodic table, the size of the atoms decreases, and on descending a group the size of the atoms increases.
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A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods (first 20 elements) of the periodic table. ... Moving rightward across the period decreases the atomic radii of atoms, while moving down the group will increase the atomic radii.
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