Electron Affinity equation/definition

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Isabel Bellon 4F
Posts: 30
Joined: Fri Sep 28, 2018 12:27 am

Electron Affinity equation/definition

Postby Isabel Bellon 4F » Wed Oct 31, 2018 10:13 am

Can someone explain to me the equation of election affinity given in lecture?

X(g)+ e- -> X- (g)
Eea= E(X)(g) - E(X-)(g)

Te Jung Yang 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: Electron Affinity equation/definition

Postby Te Jung Yang 4K » Wed Oct 31, 2018 11:22 am

The first equation is simply an example of a species gaining an electron, which relates to electron affinity as it is defined as the energy difference between the energy of a gaseous atom and the energy of the anion of the gaseous atom.
X(g)+ e- -> X- (g)

This second equation is the definition of electron affinity in an equation form.
Eea= E(X)(g) - E(X-)(g)
where Eea = electron affinity, E(X)(g) = energy of the gaseous atom, and E(X-)(g) = energy of the anion of the gaseous atom.

Ray Guo 4C
Posts: 90
Joined: Fri Sep 28, 2018 12:15 am

Re: Electron Affinity equation/definition

Postby Ray Guo 4C » Wed Oct 31, 2018 11:39 am

So stronger the electron affinity, larger the value of Eea, because X would be fairly unstable with high energy right?


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