Ionization energy/Reactivity.

  1. I read this here:

    The higher the ionization energy, the more difficult it is to remove an electron. Therefore, ionization energy is in indicator of reactivity.

    So my question is:

    How does this explain the high reactivity of the halogens?

    - I understand that they will remove electrons from other elements to achieve a noble gas configuration, but that statement above seems to disagree with how the akali metals can have a low ionization energy and be very reactive and the halogens have a very high ionization energy and be very reactive.

    Please explain.

    Thank you,
  2. jcsd
  3. Borek

    Staff: Mentor

    Yes, the wording seems to be slightly misleading. Low ionization energy suggests high reactivity, no doubt about it, but high ionization energy not necessarily means non-reactive. Although in most cases it does, as there are many more metals than non-metals in periodic table.
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