The energy of colored light increases in order: red, yellow, green, blue, violet. What are the metallic elements used in the flame test in increasing order of energy of the light emitted?

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Solution

Red: Strontium (dark), Lithium (crimson), Rubidium (red-violet)
Orange: Calcium (orange-red)
Yellow: Sodium (slightly orange)
Green: Barium
Blue: Copper (blue-green), Cesium (blue-violet), Arsenic
Violet: Potassium (more pinkish, lilac)

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