Ions {complex ion} can have more than one atom. Complex ions typically have central positive atom {mononuclear atom}. Mononuclear atom binds to negative atom ligands. Ligands can chelate to central atom at two or more sites.
properties
Central atom can have high charge, small radius, and filled or half-filled d orbitals. Central atom can have low charge, large radius, and odd number of d-orbital electrons. If central atom has higher positive charge, greater atomic weight, and/or more electrons in d orbitals, complex ion is more stable. d orbitals are most stable when they are half full or have 3, 6, or 8 electrons.
types
Heme has iron as central atom. Chlorophyll has magnesium as central atom. Vitamin B12 has cobalt as central atom.
Physical Sciences>Chemistry>Inorganic>Chemical>Molecule>Electron
5-Chemistry-Inorganic-Chemical-Molecule-Electron
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224