Question 27A complex ion is __.Multiple choice question.only found in compoundsa single atom that has formed an ionan ion with more than one atoman ion made from a large atom

The correct answer is: an ion with more than one atom.

Here's why:

A complex ion is a species formed between a central metal atom and one or more surrounding ligands, molecules or ions that contain at least one lone pair of electrons. This means that a complex ion must have more than one atom.

The other options are incorrect because:

• Complex ions are not only found in compounds. They can also exist in solutions.
• A single atom that has formed an ion is simply a monatomic ion, not a complex ion.
• The size of the atom does not determine whether an ion is complex or not. It's about the number of atoms and the arrangement in the ion.