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Electron affinity

Posted: Tue Nov 06, 2018 2:13 pm
by Samantha Man 1L
How does electron affinity change across the period table? Are there any trends?

Re: Electron affinity

Posted: Tue Nov 06, 2018 2:32 pm
by madisondesilva1c
Electron affinity decreases down a group, and increases across a period. Therefore the trend is that higher up elements and further right elements have greater electron affinity. The trend is the same trend as ionization energy.

Re: Electron affinity

Posted: Tue Nov 06, 2018 2:56 pm
by Mayaal_Khan_4H
Like electronegativity, electron affinity increases across a period and up a group because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.

Re: Electron affinity

Posted: Tue Nov 06, 2018 5:21 pm
by Shash Khemka 1K
Electron affinity increases through a period due to the fact that, as we go through a period, there is an increasing amount of valence electrons. The affinity would be the highest at the rightmost side of the periodic table because group 7 elements only need 1 more electron to complete their octet. Electron affinity increases up a group due to the energy level of the electrons.

Re: Electron affinity

Posted: Tue Nov 06, 2018 6:36 pm
by Amy Dinh 1A
An exception to the trend is that the electron affinities of the elements in column 15 are lower than those of column 14.

For example, if we needed to rank C, N, O, F in order of increasing electron affinities, the order would be N<C<O<F.

Re: Electron affinity

Posted: Wed Nov 07, 2018 11:18 am
by AdityaGuru1H
the exception also applies to phosphorus so for the 3rd row it would be P<Si<S<Cl