Pls what are complex ions in English,pls give a good step by step explanation

A complex ion is a central metal atom or ion that is bonded to a group of molecules or ions called ligands. These ligands surround the central metal.

• The central metal ion is usually a transition metal (like iron, copper, or nickel) and acts as a Lewis acid (electron pair acceptor).
• Ligands are molecules or ions (like water, ammonia, chloride, or cyanide) that have at least one lone pair of electrons. They act as Lewis bases (electron pair donors).

The ligands attach to the central metal ion through coordinate covalent bonds. This means both electrons in the bond come from the ligand.

The overall charge of the complex ion is the sum of the charge on the central metal ion and the charges of all the ligands.

A common example is the hexaaquacopper(II) ion, [Cu(H₂O)₆]²⁺.

• The central metal ion is Cu²⁺.
• The ligands are six H₂O molecules (which are neutral).
• The overall charge is (+2 from Cu) + (6 × 0 from H₂O) = +2.