Question

21 Define ionization energy. Name the factors on which ionization energy depend ? How
does it vary down the group and across a period.
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Answer 1

Answer:

The size increases as we move from top to bottom in a group. As, the electrons get added up in the new shell, the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be easier to remove. Thus, the ionization energy decreases from top to bottom in a group.