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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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Beryllium and magnesium atoms in comparison to other alkaline earth metals are comparatively smaller and their ionisation enthalpies are very high. Hence, the energy of the flame is not sufficient to excite their electrons to higher energy levels. These elements, there fore, do not give any colour in Bunsen 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.