Question

what is the overall trend in ionization energy (ie) down a group on the periodic table (group or column)? ionization energy increases down a group ionization energy decreases down a group

Explanation:

As you move down a group in the periodic table, the out - ermost electrons are farther from the nucleus and are shielded by more inner - shell electrons. This makes it easier to remove an electron, thus ionization energy decreases.

Answer:

Ionization energy DECREASES down a group