Which of these elements has the highest first ionization energy?
A) Cs
B) Ga
C) K
D) Bi
E) As

Name: Which of these elements has the highest first ionization energy? A) Cs B) Ga C) K D) Bi E) As
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Question

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First ionization energy generally increases across a period from left to right in the periodic table and decreases down a group. Among the given options, arsenic (As) is located furthest to the right and highest up (Period 4, Group 15), indicating it has the highest first ionization energy.

Which of These Elements Has the Highest First Ionization Energy