Quick question: ionization question?

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I have a quick chemistry question about the concept of highest first ionization energy.The question reads, which of the following species will have the highest ionization energy. Cl-, Ar, K+, S2-Just to verify, wouldn’t the answer be K+?

Maximus VonRueden · Accepted Answer

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 K1s2, 2s2 2p6, 3s2 3p6, 4s1The 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.

Oran Armstrong

Quick question: ionization question?

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