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Give the reasons of the following : ...

Give the reasons of the following :
First ionization enthalpy of Mg is more than that of Na but second ionization enthalpy of Mg is less than that of Na .

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First ionization energy of Mg is more than that of Na because it has smaller atomic size but `2^(nd)` ionization of Mg is less because after losing one electron sodium acquires nearest noble gas configuration.
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Knowledge Check

  • The first ionisation enthalpy of Mg is higher than the first ionisation enthalpy of:

    A
    Be
    B
    Al
    C
    K
    D
    Rb

  • The density of Ca is less than that of Mg because

    A
    nuclear charge of Ca is more than Mg
    B
    vacant 3d orbital is present in Ca
    C
    size of Ca is less than Mg
    D
    none of the above.

  • The first ionisation enthalpies of Na,Mg, Al and Si order

    A
    Na < Mg < Al < Si
    B
    Na < Mg >Al < Si
    C
    Na < Mg < Al < Si
    D
    Na < Mg < Al < Si

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    Which of the following electronic configuration would you expect to have the highest second ionization enthalpy :

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