Compound Interest

Metal Ion Flame Test Colours Chart

Poster showing the colours produced by different metal ions during flame tests. A flame test is an analytical procedure chemists use to detect the presence of particular metal ions, based on the colour of the flame produced. When heated, the electrons in the metal ion gain energy and can jump into higher energy levels. Because this is energetically unstable, the electrons tend to fall back down to where they were before, releasing energy as they do so. This energy is released as light energy. As the differences between energy levels varies from one metal ion to another, different metal ions give different characteristic colours.
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This graphic looks at the colour of various metal and metalloid ions that occur during flame tests. Most people probably remember doing this experiment in school chemistry lessons, if not with the full range of ions shown here, but, for the uninitiated, a brief explanation of the origin of the colours follows.

Flame tests are utilised in chemistry to identify the metal ions in compounds. They are more useful for some metals than others; particularly for the Group 1 metals, as they provide a good way of quickly identifying the metal ion present.

To carry out the flame tests, a small amount of the compound being tested will be held in a flame and the colour given off observed. This colour originates from the movement of electrons in the metal ion. When heated, the electrons gain energy, and are ‘excited’ into higher energy levels; however, the electrons occupying these levels are more energetically unstable, and they tend to fall back down to their original energy levels, releasing energy as they do so. This energy is released as light, with the characteristic flame colours of different metal ions due to varying electron transitions.

As stated, these tests work better for some metal ions than others; in particular, those ions shown on the bottom row of the infographic are generally quite faint and hard to distinguish. Sodium’s flame colour is also very strong, and can easily mask the colours of other metal ions.

This graphic is also purchasable in large poster form, or even on a mug, here.

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