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  • Covalent bond

    At GCSE you are taught that a covalent bond is a shared pair of electrons but you may not have...

  • Lone-pair

    A lone pair is a pair of electrons in the outer (valence) shell of an atom which is not being...

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current19:42, December 31, 2012Thumbnail for version as of 19:42, December 31, 2012150 × 120 (427 B)P.Swainson (wall | contribs)