Electron Affinity (EA) is the energy change (in kJ) from the addition of 1 mole of e â to 1 mol of gaseous atoms or io
CONCEPT: TRENDS IN ELECTRON AFFINITY Electron Affinity (EA) is the energy change (in kJ) from the addition of 1 mole of e – to 1 mol of gaseous atoms or ions. •
Generally, it ________________ going from left to right across a period and ______________ going down a group.
Atom (g) + e –
ion – (g)
∆E = - EA1
ELECTRON AFFINITY
EXAMPLE: Rank the following elements in order of increasing electron affinity. a. Cs, Hg, F, S
b. Se, S, Si
PRACTICE: Shown below are the numerical values for electron affinities (EA’s). Match the numerical values with each of the following elements provided in the boxes.
