Question: actinide ions are generally coloured?
Answer: Actinides ions in an aqueous solution are colorful, containing colors such as red purple (U3+), purple (Np3+), pink (Am3+), green (U4+), yellow green (Np4+), and pink red (Am4+). ... All actinides are characterized by partially filled 5f, 6d, and 7s orbitals.