Question

what is the overall trend in ionization energy (ie) across the periodic table (period or row)? ionization energy decreases across the period ionization energy increases across the period

Explanation:

As you move across a period (row) in the periodic table, the number of protons in the nucleus increases, leading to a greater nuclear - charge. Electrons are added to the same energy level, so there is less shielding effect. This results in a stronger attraction between the nucleus and the outermost electrons, making it more difficult to remove an electron and thus increasing the ionization energy.

Answer:

Ionization energy INCREASES across the period