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What  metals are present in these compounds?

5/4/2015

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One method that scientists use to figure out what metal ions are present in a compound is the flame test. 
In the attached video a science student is demonstrating to Vivek the different colours that are emitted when compounds containing different metal ions are heated on a platinum wire in a non-luminous flame. 
Why?
When heated, the electrons of the metal ions get excited to a higher energy level. When the electrons fall back to lower energy levels they emit light of specific wavelengths. 
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