Edexcel IAL Chemistry AS 8.17 Group 1 and 2 flame colours
Edexcel IAL Chemistry AS 8.17 Group 1 and 2 flame colours
Match the exact accepted colour to the ion, then explain that heat excites an electron and its return to a lower level releases a photon of characteristic energy.
How this is tested
- Identify Group 1 or 2 cations from their exact accepted flame-test colours.
- Explain flame colour through excitation followed by emission during a downward transition.
- Describe a clean flame-test method using hydrochloric acid and a non-luminous flame.