Question

what happens to ionization of atoms as we move down the group. explain​

Answer 1

The ionisation energy decreases while going down to the group due to increasing of shell.

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Answer 2

Answer: As you move down a group, first ionization energy decreases.  Electrons are further from the nucleus and thus easier to remove the outermost one. As you move across a period, first ionization energy increases.

Explanation: Moving left to right within a period or upward within a group, the first ionization energy generally increases. Conversely, as one progresses down a group on the periodic table, the ionization energy will likely decrease since the valence electrons are farther away from the nucleus and experience greater shielding.