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Beryllium and magnesium do not give colo...

Beryllium and magnesium do not give colour to flame whereas other alkaline eath metals do so. Why?

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Because of the small size, the lonization enthalpies of Be and Mg are much higher than those of other alkaline earth metals. Therefore, they need large amount of energy for excitation of their valence electrons to higher energy levels. Since such a large amount of energy is not available in Bunsen flame, therefore, these metals do not impart any colour to the flame.
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Why Beryllium and magnesium do not impart colour to the flame?

Beryllium and magnesium do not impart any colour to the flame test. The reason is that

Be and Mg atoms do not impart colour to the flame.

Beryllium has less negative value of reduction potentials compared to other alkaline earth metals due to:

Assertion (A): Be and Mg impart characterstic colour to the flame. Reason (R ): As compared to other alkaline earth metals, ionisation enthalpy of Be and Mg is low.