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Electron affinity

Posted: Thu Oct 26, 2017 7:44 pm
by MorganYun1H
does the nuclear charge have an effect on electron affinity or is it only because of the atom having an almost filled valence shell?

Re: Electron affinity

Posted: Thu Oct 26, 2017 8:23 pm
by Abdullah2I
i believe the nuclear charge always affects the electron affinity but I'm not 100% sure about the other part of your question.

Re: Electron affinity

Posted: Fri Oct 27, 2017 10:14 pm
by Sabrina Dunbar 1I
The number of valence electrons greatly affects the electron affinity of an atom. An atom is much more likely to gain an electron from another atom when their outer valence shell is almost filled because they are looking to reach the ideal state of having a full outer shell. Because the nuclear charge of ions relates directly to the number of electrons in their valence shell, this also has an affect on the electron affinity of an ion.

Re: Electron affinity

Posted: Fri Oct 27, 2017 10:18 pm
by Christy Lee 2H
Nuclear charge plays a role because higher nuclear charge will have a greater pull on electrons which means higher electron affinity, which is why electron affinity increases going across a row. The almost-full valence shell is another way of thinking about it, because atoms want to have noble gas configurations.

Re: Electron affinity

Posted: Sun Oct 29, 2017 11:59 pm
by Rebecca Doan 2L
Electron affinity is equal to the negative change in energy.