Bickeldefines the political question doctrine, in the passage quoted in sec-tion I, in terms of the Court's sense of unease at straying into thedecision of difficult and delicate questions involving the separationof powers and requiring political expertise or sensitivity to makean intelligent decision.
A chelate is a chemical compound composed of a metal ion and a chelating agent. A chelating agent is a substance whose molecules can form several bonds to a single metal ion. In other words, a chelating agent is a multidentate ligand. An example of a simple chelating agent is ethylenediamine.ethylenediamine. A single molecule of ethylenediamine can form two bonds to a transition-metal ion such as nickel(II), Ni 2+ .n other words, a chelating agent is a multidentate ligand. An example of a simple chelating agent is ethylenediamine. ethylenediamine. A single molecule of ethylenediamine can form two bonds to a transition-metal ion such as nickel(II), Ni 2+ .
The chelate effect describes the enhanced affinity of chelating ligands for a metal ion compared to the affinity of a collection of similar nonchelating (monodentate) ligands for the same metal.helate complexes are contrasted with coordination complexes composed of monodentate ligands, which form only one bond with the central atom. The word chelation is derived from Greek ÏÎ·Î»Î®, chÄlÄ, meaning claw; the ligands lie around the central atom like the claws of a lobster.