10-26-11 - Chemistry 1A F11 10.26.11 Dr Shaka Electron...

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168 Chemistry 1A F11 10.26.11 Dr. Shaka Course Code 40000 Electron Affinity • Electron affinity is not really much different from ionization energy. • Actually, we could consider the electron affinity of a neutral atom to be the “zeroth” ionization energy: Energy + X " g ( ) # X g ( ) + e " • It is easier to ionize an electron from an anion than it is from a neutral atom, or a cation, so electron affinities are usually smaller than ionization energies.
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169 Chemistry 1A F11 10.26.11 Dr. Shaka Course Code 40000 Electron Affinity • If we write the reaction backwards, then the energy is negative, as we get energy rather than putting it in: X g ( ) + e " # Energy + X " g ( ) • Although this is the reaction that textbooks write when they speak of electron affinity, in actual fact the numbers quoted are positive. • Thus, EA is really just IE for an anion. • We can also have doubly-charged anions like O 2 and it may take energy to go to O .
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170 Chemistry 1A F11 10.26.11
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This note was uploaded on 12/12/2011 for the course CHEM 1A taught by Professor Tobias during the Fall '01 term at UC Irvine.

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10-26-11 - Chemistry 1A F11 10.26.11 Dr Shaka Electron...

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