1.

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

Answer» Because of the small size, the ionisation 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 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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