A ligand that has more than one atom that coordinates directly to the central atom in a complex. Polydentate ligands are called chelating agents when two or more coordinating atoms are attached to the same metal ion in a complex. For example, EDTA or ethylenediaminotetracetic acid is a hexadentate ligand of calcium ion. A colorless, odorless, flammable gas, found in petroleum and natural gas. It is used as a fuel and as a raw material for building more complex organic molecules.
Propane is the third member of the alkane series.
A mixture of equal parts of the levorotatory and dextrorotatory isomers of the the same substance. Racemic mixtures are not optically active . Compare with weak ligand . A ligand that causes a large crystal field splitting which results in a low-spin complex . For example, KO 2 is potassium superoxide, an ionic compound containing the superoxide ion, O 2 - . tautomer.