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Why first ionisation enthalpy of Cr is l...

Why first ionisation enthalpy of Cr is lower than that of Zn?

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Ionisation enthalpy of Cr is less than that of Zn because Cr has stable `d^(5)` configuration. In case of zinc, electron comes out from completely filled 4s-orbital. So, removal of electron from zinc requires more energy as compared to the chromium.
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Knowledge Check

  • The first ionisation potential of Al is smaller than that of Mg because:

    A
    the size of `Al` is bigger than `Mg`
    B
    ionisation enthalpy decrease in a period from left to right
    C
    it is easier to remove electron from unparied `3 p^(1)` than from paired `3s^(2)`
    D
    aluminium is a passive metal while magnesium is active metal.

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