Choose the best answer that completes the sentence. A complex ion contains . Group of answer choices a central nonmetal ion bound to one or more ligands. a central metal ion bound to one or more ligands. an anion bound to water. water bound to one or more ligands. ammonia bound to water.

A COMPLEX ION contains (a central metal ion bound to one or more ligands).

Explanation: A complex ion is defined as an ion that is formed between a central metal ion and one or more surrounding ligands, molecules or ions that contain at least one lone pair of electrons. The formation of a complex ion from a metal ion and a ligand is based on Lewis acid - base reaction. The positively charged metal ion( example Cu2+) acts as a Lewis acid, and the ligand, with one or more lone pairs of electrons (example NH3), acts as a Lewis base.

An example of a complex ion is copper ammine ion,{[Cu(NH3)6]2+}.

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