Determine Electron Affinity

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Hannah Guo 3D
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Joined: Fri Sep 29, 2017 7:06 am

Determine Electron Affinity

Postby Hannah Guo 3D » Sun Nov 12, 2017 8:24 pm

I'm a little confused about why from Ni to Pd, the electron affinity decreases, but from Cu to Ag, electron affinity increases. In both of the cases, the second element is in the same group as the first element.

Emma Li 2C
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Re: Determine Electron Affinity

Postby Emma Li 2C » Sun Nov 12, 2017 8:47 pm

I think it has to do with Cu being the exception in filling the electron d-block subshells! Because Cu has 10 electrons in the 3d subshell and only 1 electron in the 4s subshell, it would become more stable completing the lone pair in 4s.

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Re: Determine Electron Affinity

Postby EveEmm3D » Sun Nov 12, 2017 8:56 pm

I think Pd has a lower electron affinity than Ni because it has a complete 4d10 subshell. As for Cu and Ag, which have the same valence shell configuration, Ag might have a slightly higher electron affinity than Cu because it has more protons? The difference between their electron affinities is very small though right?

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