An atom of which of the following elements has the smallest first ionization energy?

Name: An atom of which of the following elements has the smallest first ionization energy?
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Question

Quizplus · Accepted Answer

Rb (Rubidium) has the smallest first ionization energy because it is located in the lower left corner of the periodic table, where elements have the lowest ionization energies due to their larger atomic radii and the increased distance of the valence electron from the nucleus.

An Atom of Which of the Following Elements Has the Smallest