lattice

Discussion in 'Chemistry' started by rohIT, Feb 19, 2013.

  1. rohIT Registered Senior Member

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    the co-ordination number and the lattice of a salt is determined by the Rc/Ra ratio where Rc is the radius of cation and Ra is the radius of anion. this ratio is always less than one.
    but what about metal hydrides? how is the lattice of a metal hydride? i mean shouldnt the ratio be more than one here?
     
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  3. origin Trump is the best argument against a democracy. Valued Senior Member

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    Well in the metal halide \(AlH_3\) the Al certainly is larger than the 3 hydrogens so I guess the ratio is higher than 1.
     
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  5. Nasor Valued Senior Member

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    Who told you that? It's not always less than 1. Its *usually* is less than 1, but there are plenty of examples where it isn't. Metal hydrides are one example, as you said. Another random example would be thallium fluoride.
     
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  7. rohIT Registered Senior Member

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    nobody told me as such, but my book listed only the examples of the less than 1 category.
    can you give me some references where their lattice structures n other details are mentioned?
    thanks

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  8. rodereve Registered Member

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    when's your homework due?

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