Electron Affinity

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Shannon Asay 1C
Posts: 102
Joined: Fri Aug 09, 2019 12:16 am

Electron Affinity

Postby Shannon Asay 1C » Fri Oct 25, 2019 11:22 am

Could someone explain the periodic trend for electron affinity?

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: Electron Affinity

Postby Sartaj Bal 1J » Fri Oct 25, 2019 11:30 am

Electron affinity is defined as the energy released when electrons are added to the gas phase atom. It increases from left to right across periods and upwards for groups. For groups, this occurs because as principal quantum number increases down a group, the size of the orbital increases (atomic radius increases) so the affinity for the electron is less. Moving from left to right across a period, the forces of attraction from the protons become stronger because of their greater number so the electron comes closer to the nucleus, hence increasing affinity. Overall, the trend is the same as electronegativity and ionization energy.

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Electron Affinity

Postby Justin Quan 4I » Fri Oct 25, 2019 11:37 am

To add on, electron affinity is basically the likelihood of an atom to gain an electron. Electron affinity increases upward for the groups and from left to right across periods of a periodic table. Hopefully this image helps you visualize the trend.


Image

Miriam Villarreal 1J
Posts: 105
Joined: Sat Aug 17, 2019 12:16 am

Re: Electron Affinity

Postby Miriam Villarreal 1J » Fri Oct 25, 2019 11:49 am

Electron affinity increases upward for the groups and from left to right across periods of a periodic table because the electrons added to energy levels become closer to the nucleus, thus a stronger attraction between the nucleus and its electrons.

kristi le 2F
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: Electron Affinity

Postby kristi le 2F » Fri Oct 25, 2019 11:33 pm

Is electron affinity the same as electronegativity?


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