Question

why do be and mg not impart colour to Bunsen flame where as all other alkaline earth matels do so?

Answer 1

Question is not define well....

Answer 2

When these electrons return to their ground states, they emit extra energy in form of radiations which fall in the visible region thereby imparting a characteristic colour to the flame. Be and Mg do not impart any colour to the fame i.e. they do not give flametest. This is due to their very small size.

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