Ionization energy is the energy required to remove an electron from a gaseous atom or ion.
The trend of the ionization energies of the elements can be observed in the periodic table:
• increases going from left to right of a period
• decreases going down a group
Let’s check their location in the periodic table and see how they fall in the trend mentioned.
Using only the periodic table, rank the following elements in order of increasing ionization energy: Br, F, Ga, K, and Se.
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