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Glossary of Terms for Transition
Ligand Atoms or ions, which possess lone pairs of electrons.
(from co-ordinate bonds to the central ion.) (Donate a lone pair
of electrons into vacant orbitals on the central species.) e.g. H2O,
NH3, Cl-, OH-.
Complex ion Formed when species called ligands form co-
ordinate bonds to a central species such as a transition metal
Co-ordination No The number of co-ordinate bonds formed to
the central ion.
Bidentate Ligand Form two co-ordinate bonds
Geometric Isomerism A chemical species with the same type
and quantity of atoms as another species, yet having a different
Optical Isomerism Same molecular formula, rotating polarised
light because of one or more chiral centres.…read more