MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Test tube of copper/ chloride complex ion. Cl-. The ions of transition metals are coloured. This makes it possible to tell which ion is present in a solution. The copper/chloride ion is yellow because most of the absorption band is in the UV part of the spectrum - 390nm.
Model release not required. Property release not required.