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in Alkali and Alkaline Earth Metals by (45.7k points)
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Berllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

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Due to small size, the ionization enthalpies of Be and Mg are much higher than those of other alkaline earth metals. Therefore, a large amount of energy is needed to excite their valence electron and that’s why they do not impart colour to the flame.

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