The accurate description of the ionization energies of elements in the periodic table is; the ionization energy of lithium is greater than that of potassium.
In the periodic table, ionization energy decreases down the group and increases across the period. So, as we move from left to right in the table, it takes more energy to remove an electron from the atom.
Lithium and potassium are members of group 1, Lithium is far higher than potassium. It takes more energy to remove an electron from lithium than for potassium.
Hence, the ionization energy of lithium is greater than that of potassium.
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