CHM 113 Lecture : Electron Affinity
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Electron affinity, EA, is the energy required to add an electron to a neutral gaseous atom and is related to an element's position on the periodic table. Electron affinities can be positive, negative, or zero, as shown in the table.
Element | Electron affinity (kJ/mol) |
N (nitrogen) | >0 |
F (fluorine) | â328 |
Ca (calcium) | â2 |
1. Rank the following elements by electron affinity, from most positive to most negative EA value: Ar, I, Rb, P, O.
Part A) For the elements with the electron affinities given in the table in the introduction, which element is most likely to accept an electron?
P |
O |
Be |
Element | Electron affinity (kJ/mol) |
P (phosphorus) | â72 |
O (oxygen) | â141 |
Be (beryllium) | >0 |
Part B) Rank the following elements by electron affinity, from most positive to most negative EA value.
Rank from most positive to most negative. To rank items as equivalent, overlap them.
potassium
helium
tellurium
bismuth
chlorine