alkaline earth metals
alkali metals
transition metals
group VII elements
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something like complex ionic molecules are ligands and basically common in transition metals, the likes of ferrocyanides and so on
The correct answer is C, water molecules can act as ligands when they are bonded to transition metals. Transition metals are elements that have partially filled d orbitals in their atoms, and can form covalent bonds with other molecules, including water molecules. In these bonds, the water molecule acts as a ligand, which is a molecule that donates a pair of electrons to form a coordinate covalent bond. Transition metals are unique in their ability to form these bonds with water molecules, making them important in many biological and industrial processes
