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The order of first ionization energies o...

The order of first ionization energies of the elements Li,Be,B,Na is :

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The correct Answer is:
B
Ionization energies increase in a period on moving left to right while it decreases in a group on moving downward. The I.E. of Be is greater than B due to completely filled s-orbital . Hence the order of IE is as: Be> B > Li > Na
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Knowledge Check

  • Ionization energy of an element is:

    A
    Equal in magnitude but opposite in sign to the electron gain enthalpy of the cation of the element
    B
    Same as electron affinity of the element .
    C
    Energy required to remove one valence electron from an isolated gaseous atom in its ground state
    D
    Equal in magnitude but opposite in sign to the electron gain enthalpy of the anion of the element

  • The increasing order of the first ionization enthalpy of the elements B, P, S and F (lowest first) is BltPltSltF , BltSltPltF , FltSltPltB , PltSltBltF ,

    A
    'BltPltSltF'
    B
    BltSltPltF'
    C
    FltSltPltB'
    D
    PltSltBltF'

  • The correct order of first ionisation enthalpies of the following elements is

    A
    `BegtMggtCagtSrgtRagtBa`
    B
    `RagtBagtSrgtCagtMggtBe`
    C
    `BegtMggtCagtSrgtBagtRa`
    D
    `RagtSrgtBagtMggtCagtBe`

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