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wood prints copper wood prints copper ii sulphate wood prints strontium wood prints strontium chloride wood prints sodium wood prints sodium chloride wood prints copper ii chloride wood prints potassium wood prints potassium chloride wood prints flame wood prints bunsen burner wood prints laboratory equipment wood prints flame test wood prints laboratory wood prints classroom wood prints

photographs copper photos copper ii sulphate photos strontium photos strontium chloride photos sodium photos sodium chloride photos copper ii chloride photos potassium photos potassium chloride photos flame photos bunsen burner photos laboratory equipment photos flame test photos laboratory photos classroom photos

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Flame test sequence. Montage of a series of positive results of flame tests for various metal elements. The colours are due to the excitation of electrons in the metals by the heat of the flame. As these electrons lose their energy, they emit photons of light. The colour of the flame is different for different elements and can be used to identify unknown substances. The ones shown here are (left to right): barium (pale green), strontium (red), lithium (red), sodium (yellow), copper (green), and potassium (lilac).

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