As one progresses left to right across a period on the periodic table,first ionization energy generally

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As one progresses left to right across a period on the periodic table, the number of protons in the nucleus increases, and the atomic radius decreases. This results in a stronger attraction between the positively charged nucleus and the negatively charged electrons. Therefore, it becomes more difficult to remove an electron, and first ionization energy generally increases.

As One Progresses Left to Right Across a Period on the Periodic