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Unformatted text preview: largest negative magnitude ) In adding an electron they achieve a stable electron configuration like the noble gases The 2A and 8A groups have filled subshells (s, and p, respectively) and therefore, an additional electron must reside in a higher energy orbital . Adding an electron to these groups is an endothermic process The general trend is for the electron affinity to become increasingly negative (stronger binding of an electron) as we move across each period toward the halogens. Electron affinities do not change much as we move down a group The distance from the nucleus is increasing with greater n (less attraction) however, The electrons in the subshell are more diffuse, reducing electron-electron repulsions Element Ion E (kJ/mol) F F--328 Cl Cl--349 Br Br--325 I I--295...
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