Which of the following elements is known for forming complex ions?

Which of the following elements is known for forming complex ions?

Step 1: Understand what complex ions are. Complex ions are formed when a central metal atom or ion bonds with surrounding molecules or ions called ligands.
Step 2: Identify the elements that are known to form complex ions. Common elements that do this include transition metals like copper (Cu), iron (Fe), and nickel (Ni).
Step 3: Focus on copper (Cu). Copper is a transition metal that has the ability to bond with various ligands, making it a good candidate for forming complex ions.
Step 4: Conclude that copper (Cu) is known for forming complex ions due to its ability to coordinate with ligands.

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