30Periodic2

E trend 1s be b 1s n o 2s 2p the drop in ei is due to

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Unformatted text preview: es in I.E. trend 1s Be B 1s N O 2s 2p The drop in E.I. is due to : the 2s electrons shielding the 2p electron repulsion with in the same orbital 2s 2p Electron affinity Electron affinity is the energy change that occurs when an electron is accepted by an atom in the gaseous state (kJ/mol). X(g) + eX-(g) The more negative the electron affinity ,the greater the tendency of the atom to accept an electron . Electron affinity X(g) + eX-(g) (-) kJ/mol The sign of the electron affinity represents the energy released when an electron is accepted. X(g) X+(g) + e– (+) kJ/mol A positive ionization energy means that energy must be supplied to remove an electron A positive electron affinity signifies that energy is liberated when an electron is added Electron affinity Electron affinity increases increases Electron affinity Electron affinity decreases decreases Electronegativity Electronegativity measure of an element to attract electrons toward itself when bonded to another element An electronegative element attracts electrons. A...
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This note was uploaded on 02/13/2009 for the course CHEM 101 taught by Professor Taracarpenter during the Spring '08 term at UMBC.

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