Which of these elements has the smallest first ionization energy?
A) Cl
B) Na
C) Be
D) K
E) As

Name: Which of these elements has the smallest first ionization energy? A) Cl B) Na C) Be D) K E) As
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Question

Quizplus · Accepted Answer

First ionization energy generally decreases down a group in the periodic table because the outer electrons are further from the nucleus and are therefore easier to remove. Among the options given, potassium (K) is the lowest in its group, making it the element with the smallest first ionization energy.

Which of These Elements Has the Smallest First Ionization Energy