Which Of The Following Has The Largest Second Ionization Energy?

(Correct Answer Below)

Which Of The Following Has The Largest Second Ionization Energy?

(a). Ca (b).K (c). Ga (d). Ge
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b.) K. Explanation: The second ionization energy (IE) is the minimum energy needed to remove two electrons from the ground state of the isolated gaseous atom or ion. If an atom reaches a stable noble gas configuration after the removal of the first electron then naturally the second IE will be higher as it will resist losing its noble gas electron configuration. Of the 4 elements listed in this question, K will have reached the noble gas configuration after losing one electron and will have the highest second IE.

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