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Which of the elements Na, Mg, Si and P h...

Which of the elements Na, Mg, Si and P have the greatest difference between first and second ionization enthalpies? Briefly explain your answer.

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The element Na is expected to have the greatest difference between `IE_1 and IE_2` values. After losing one electron, `Na^+` ion acquires a noble gas configuration and the removal of the second electron is difficult as compared to other elements.
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Knowledge Check

  • The element having greatest difference between its first and second ionization energies, is

    A
    `Ca`
    B
    `Sc`
    C
    `Ba`
    D
    `K`

  • The element having greatest difference between its first and second ionization energies, is:

    A
    Sc
    B
    Ca
    C
    Ba
    D
    K

  • The lectronic configuration of the atom having maximum difference in first and second ionzation enthalpies is

    A
    `1s^(2)2s^(2)2p^(6)3s^(1)`
    B
    `1s^(2)2s^(2)2p^(3)`
    C
    `1s^(2)2s^(2)2p^(1)`
    D
    `1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)`

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    From each set, choose the element with highest ionization enthalpy and explain your answer. Mg,P,Ar

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