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Topic: Lattice Energy?  (Read 27548 times)

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Offline Pooh

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Lattice Energy?
« on: November 17, 2007, 12:51:20 AM »
Please Arrange the following substances in order of increasing magnitude of lattice energy and explain how you came up with the answer...

KCl, SrO, RbBr,CaO
and
CsI, KBr, KI, MgS, BeO

SO I get
KCl, RbBr, MgO, CaO
large to small
KBr, CsI, KI, BeO, MgS

but the program says its not right? Can anyone help me, please? :(
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Offline Yggdrasil

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Re: Lattice Energy?
« Reply #1 on: November 17, 2007, 02:02:59 PM »
Which has a greater potential energy, opposite charges placed closer together or charges placed farther apart?  Are the charges of MgO closer together or farther apart compared to CaO?
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Offline farazali

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Re: Lattice Energy?
« Reply #2 on: November 23, 2007, 12:49:38 PM »
the ones with higher lattice energy will be the ones that have smaller atomic radii (nuclei of the ions closer together) that also have the highest charges (more charge = more energy; more charge that is closer together equals higher repulsion and therefore a higher energy state).
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