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Why do alkali metals impart colour to the flame?

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Why do alkali metals impart colour to the flame? 

(a) They are electropositive elements. 

(b) They have low ionisation energies. 

(c) They belong to IA group. 

(d) They form ionic compounds.

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(b) They have low ionisation energies. 

The element of group 1 (alkali metals) and group 2 (alkaline earth metals) have 1 and 2 electrons respectively in their valence shells and hence have low ionisation energies In other words, elements of group 1 and 2 impart colour to the flame.

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