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The pairs of electrons that exist in the valence shells of atoms repel each other as far as possible. This repulsion helps determine the shapes of molecules formed in covalent compounds. This podcast shows some of these possible shapes and explains their formation.
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These chemistry video podcasts are high school chemistry snippets, from Mt Lawley Senior High School.
To help make these resources more useful your feedback would be appreciated.
You may also want to check out my physics video podcasts at www.meaghersphysics.podomatic.com.
Thanks,
Richard.
