up learn

• We see objects as coloured when they...

  absorb some frequencies of visible light but transmit or reflect others
• To absorb visible light there must be...

  room for an electron in one orbital to be excited into another

  and the difference between their energy levels must correspond to a frequency of visible light
• Cr: [Ar] 4s1 3d5
• Cu: [Ar] 4s1 3d10
• Transition metals...

  form stable ions with partially filled d-sibshell
• A ligand is...

  a molecule or ion with a lone pair of electrons that form a dative covalent bond with a metal ion
• Coordination number is...

  the number of dative covalent bonds in a complex
• The coordination number is affected by...

  the size of the ligand
• Metal complexes can have the shapes...

  octahedral, tetrahedral, square planar or linear
• The elements that form square planar complexes are...

  Ni Pd Pt
• Optical isomerism in metal complexes occurs in...

  square planar and octahedral shapes with 2 identical ligands