Analysis: 1) it's known that all the compounds tested contain chlorine. Therefore it is safe to assume that the other elements the compounds tested are all different. This is because each element has its own line spectra, which is the color seen when it's tested on a spectrogram. 2) Atomic emission spectra are created when atoms of an element have energy added to them (by heating, or running electric current through an emission tube filled with a gas). With the naked eye, you see a single color of light (which is the sum total of all the colors of light produced by a given element ) 3) Element 1: Orange-green: Possibly could have been Barium Element 2: Orange: Possibly could have been Strontium Element 3 : Orange-Pink: Possibly could have been Lithium Element 4: Orange-purple: Possibly could have been Potassium Element 5: Orange: Possibly could have been Calcium Element 6 : Pink: Possibly could have been Radium
