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Topic: Lattice Energy And Electron Affinity//  (Read 5352 times)

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Offline ay2k

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Lattice Energy And Electron Affinity//
« on: May 26, 2008, 12:12:05 PM »
Queries regarding electron affinity and Lattice Energy follow...

1) Why is the first electron affinity value usually negative?

2) "With increase in covelancy in an ionic compound, its lattice energy becomes more negative." Is this statement correct, and if yes, why?



An answer ample for A'Level purposes is required...
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Offline Mitch

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Re: Lattice Energy And Electron Affinity//
« Reply #1 on: May 26, 2008, 06:16:19 PM »
1) I doubt it would be negative for Helium. Can you give the general chemical equation for electron affinity?
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Offline ay2k

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Re: Lattice Energy And Electron Affinity//
« Reply #2 on: May 27, 2008, 06:19:56 AM »
He   +   e-   --> He-

ok??
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