Second Ionization Energy

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Ella Bouris
Posts: 14
Joined: Thu Jul 27, 2017 3:01 am

Second Ionization Energy

Postby Ella Bouris » Tue Dec 05, 2017 10:22 pm

Would Mg or Na have a smaller second ionization energy? I know Na has a smaller first ionization energy but does that same trend carry on with second ionization energies?

Kevin Ru 1D
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Second Ionization Energy

Postby Kevin Ru 1D » Tue Dec 05, 2017 10:57 pm

Mg will actually have a smaller second ionization energy than Na because the first ionization energy of Na results in Na+ having a full valence shell (similar to Ne). As having a full valence shell is very favorable, it will be more difficult to remove a second electron from Na in comparison to Mg (which has a valence similar to Na after the first ionization energy). In general, subsequent ionization energies will follow the same trend as the first, but remember to look out for situations such as these. Hope that helps!

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