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four shared electrons, or two shared pairs of electrons (or two covalent bonds) between the same two atoms.
reactions in which an atom or group of atoms is replaced in a molecule by another atom or group...
forces of attraction between non-polar molecules (H2; CH4 ) or the atoms of a monatomic gas...
a material that allows electricity to pass through it very easily.
the orientation of the functional groups of a molecule in space.