L07 Chem 111A Lecture 11: Chem Week 11
6 Nov 2015
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Electron affinity (ea): the energy released when an electron is added to a gaseous atom to form an anion. Ea values are positive even though energy is released. Atomic radii increases top to bottom and decreases left to right. Electron affinity increases left to right and decreases top to bottom. Ionization energy increases left to right and decreases top to bottom. Z* increases left to right and decreases top to bottom. Noble gases: electron must be added to the next shell. n (mpa) increases significantly thus energy is required to add an electron and ea values are negative. Ionic radii: r_anion > r_neutral atom anion: same # of protons as the atom but 1 more electron. Thus, z* decreases upon the formation of an anion and ionic radii increases. r_cation < r_neutral atom. Cation: same # of protons but fewer electrons. The ability of an atom in a molecule o attract electrons to itself and away from neighboring atoms.
