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Electron Affinity in Group 15

Posted: Thu Oct 13, 2016 9:52 pm
by Kendall_Islam_3A
We learned in lecture that nitrogen is an exception to the general trend of elements' electron affinity to increase toward the top right of the table. Is this exception also true for other elements in Group 15 or only nitrogen, and if so, why?

Re: Electron Affinity in Group 15

Posted: Fri Oct 14, 2016 12:00 am
by Brandon_Wu_2L
The electron affinity for elements in Group 15 is much lower than elements in Group 14, 16, or 17 because elements in Group 15 have a half filled p subshell which is more stable than having an electron in Px, Py but not Pz orbital, or having not a full 6 electron p subshell. So they break the periodic trend of increasing electron affinity to the top right of the periodic table because Group 14 elements have a higher electron affinity because they would have more stable half filled p subshell by gaining an electron.