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

Beryllium & magnesium do not give colour to flame whereas other alkali

1.	Beryllium & magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?
Answer» SOLUTION :Due to smaller size, valence ELECTRONS of Be and Mg are more tightly held by the nucleus. Therefore, they need a large amount of energy for the excitation of their valence electrons to higher energy levels. SINCE such a large amount of energy is not available from bunsen flame, these two metals do not IMPART any colour to the flame.