Q.
Alkali metals impart colour to Bunsen flame due to
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NTA AbhyasNTA Abhyas 2020The s-Block Elements
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Solution:
Because of low ionization energy, the electron of the valence shell of alkali metals can be easily excited by the energy of the flame. When these electrons return to their original level (ground state), the excitation energy, which has been absorbed by them, is released in the form of light in the visible range.