Mrs. Leta Kub PhD
Nov 06, 2024
Quick question: ionization question?
I have a quick chemistry question regarding the concept of first ionization energy. The question is as follows: Which of the following species will have the highest ionization energy: Cl⁻, Ar, K⁺, or S²⁻? Just to clarify, would the answer be K⁺?
1 Answers
The ionization energy is the energy required to remove an electron. Removing an an electron from Cl- or S^2- would require less energy than needed for the respective neutral atom due to the repulsion between the existing electrons and the “extra” electrons.
Removing an electron from K+ requires removing it from an “inner” energy sublevel which is closer to the nucleus and would require a great deal of energy. The ionization energy for K+ is actually the second ionization energy of K, and is quite high.
Electron configuration of K
1s2, 2s2 2p6, 3s2 3p6, 4s1
The first ionization energy is the energy needed to remove the 4s electron. The second ionization energy is the energy required to remove a 3p electron, which is considerably more energy.
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