Emission spectra is the specific colour of light that each element gives. Each colour is unique to each element. If electrons absorb energy, they can be bumped to a higher level, but when the fall to a lower level, they release that energy as light.
The picture to the left is a spectra of the elements of lithium, sodium, potassium, rubidium, cesium, mercury and neon.
-- Jael Lumba
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