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Lithium is monovalent . Magnesium is div...

Lithium is monovalent . Magnesium is divalent. But Li and Mg are diagonally related pair of elements. Why ?

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Lithium and Magnesium have certain similarities in their properties. Hence, they are called diagonally related pair of elements
(a) Li and Mg have simillar electronegativity .
(b) `Li^(+)` and `Mg^(2+)` have similar polarising power.
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