Which ion is indicated by a blue-green flame?

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Multiple Choice

Which ion is indicated by a blue-green flame?

Explanation:
The flame color test works because heating a metal ion excites its electrons, and when those electrons drop back to lower energy levels they emit light at specific wavelengths. Copper(II) ions emit light in the blue-green part of the spectrum, so their flame appears turquoise or blue-green. This color is distinct from the other common flame colors: sodium gives a strong bright yellow, calcium gives a brick-red/orange-red, and iron(III) tends to a yellowish-orange. So a blue-green flame is a good indicator of copper(II) ions.

The flame color test works because heating a metal ion excites its electrons, and when those electrons drop back to lower energy levels they emit light at specific wavelengths. Copper(II) ions emit light in the blue-green part of the spectrum, so their flame appears turquoise or blue-green. This color is distinct from the other common flame colors: sodium gives a strong bright yellow, calcium gives a brick-red/orange-red, and iron(III) tends to a yellowish-orange. So a blue-green flame is a good indicator of copper(II) ions.

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