2. The diagram below represents the bright-line
spectra of four elements and a bright-line spectrum
produced by a mixture of two of these elements.
Which two elements are in this mixture?
(1) barium and hydrogen
(2) barium and lithium
(3) helium and hydrogen
(4) helium and lithium
Answers: 2
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2. The diagram below represents the bright-line
spectra of four elements and a bright-line spectrum...
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