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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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Knowledge Check

  • Be and Al are diagonally related pair of elements. However, they don't have similarity in the following property.

    A
    metallic nature of elements
    B
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    C
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    D
    electrical conductivity

  • Assertion: Lithium resembles magnesium in its properties Reason: The ratio of ionic charge to "(Ionic radius)"^2 is almost same for Li^+ and Mg^(2+)

    A
    Both Assertion and Reason are true and Reason is the correct explanation of Assertion
    B
    Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
    C
    Assertion is true but Reason is false
    D
    Assertion is false but Reason is true

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    What is diagonal relationship? Give a pair of elements having diagonal relationship. Why do they show this relation?

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