CHEM 1062 Chapter Notes - Chapter 23.2-4: Rare Earth Element, Counterion, Ion
Document Summary
14 lanthanides and 14 actinides are the inner transition elements because of their 7 inner 4f or 5f orbitals. Lanthanides 4f series = rare earth elements, silvery, high melting metals. Properties vary very little across the period. Most have the ground state configuration [xe] 6s^2 4f^x 5d^0 where x varies across the series. Exceptions to that are caused by wanting a filled or half filled sublevel. Actinides 5f series - are radioactive; all have very similar physical and chemical properties. Silvery and chemically reactive and form highly colored compounds. Complexes - species contain at least one complex ion which consists of a central metal cation bonded to molecules and/or anions called ligands. To maintain charge neutrality, the complex ion is associated with counter ions. A coordination compound behaves like an electrolyte in water; complex ion and counter ions separate. The complex ion acts behaves like a polyatomic ion because the ligands and central metal ion are attached.
