What's Complex Compound?

A Coordination Complex is a substance in which a transition metal atom or ion accepts electrons from a group of neutral molecules or anion called “Ligands”. Zinc, Cadmium and Mercury doesn’t transition metals but they can make a complex compound because of the two s orbital electrons. Zn, Cd, and Hg are always going to exist in their +2 state in complex, or coordination compounds- simply because a fully occupied d orbital is extremely stable. The two s orbital electrons are responsible for these metals forming coordination compounds. A complex can be a cation ion, an anion ion, or neutral molecules. The symbol of

-        A cation complex is [Transition Metal (ligands)]Non-Metal or [Transition Metal (ligands)]⁺ⁿ.

-        An anionic complex is Metal[Transition Metal (ligands)] or [Transition Metal (ligands)]^-n.

-        A neutral complex is [Transition Metal (ligands)] or Transition Metal (ligands)

“ n ” is the charge of complex compound.

For example: K₂[Fe(CN)₄] is an anionic complex. [Cr(NH₃)₃(H₂O)₃]Cl₃ is a cation complex. Fe(CO)₅ is a neutral complex compound.