Why do some elements glow in a flame test?
Quick Answer
They glow because heat excites their electrons to higher energy levels, and the electrons release light as they fall back down. Different elements emit different colors.
The Full Story
A flame test works by heating a sample so its electrons absorb energy and jump to higher energy states. When those electrons return to lower states, they emit light at characteristic wavelengths, creating distinct flame colors. Sodium gives a bright yellow flame, potassium a lilac flame and copper compounds can produce blue-green colors. This technique has been used since the 19th century as a simple way to identify certain elements and ions.
Key Facts
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