Question

Why different alkali metals have different colours when burn -?

Answer 1

Answer:

When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.

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Answer 2

Answer:

because the photons emitted as these electrons jump back each have different energy levels and therefore emit light of a different colour.