below arediagramsforthebrightline(akaatomicemission)spectraoffourelementsandthespectrumofamixtureofunknowngases.

below  are diagrams for the bright line (aka atomic emission) spectra of four elements and the spectrum of a mixture of unknown gases. 

 Which element(s) are NOT present in the unknown?

 Which element(s) ARE present in the unknown? 

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