Ionization enthalpy (IE) is the energy required to remove the highest-energy electron from a neutral atom. In general, ionization energy increases across a period and decreases down a group.
So, for your question ⇻IE decreases down the group.
As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.
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As we move from left to right across a period, the ionization energy of elements increases. This is due to the decrease in the size of atoms across a period.