Which of the following elements has the highest ionization energy?

Name: Which of the following elements has the highest ionization energy?
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Question

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Ionization energy increases as you move across a period from left to right due to the increase in effective nuclear charge (the attraction between the electrons and protons in the nucleus). Among the given options, Ar is the noble gas with the highest effective nuclear charge, thus requiring the most energy to remove an electron.

Which of the Following Elements Has the Highest Ionization Energy