Emission spectra
You
have learnt previously about the structure of an atom. The electrons
surrounding the atomic nucleus are arranged in a series of levels of
increasing energy. Each element has its own distinct set of energy
levels. This arrangement of energy levels serves as the atom's unique fingerprint.
http://m.everythingscience.co.za/grade-12/16-optical-phenomena-and-properties-of-matter/16-optical-phenomena-and-properties-of-matter-04.cnxmlplus
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