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

Beryllium and magnesium do not give colour to flame whereas other alka

1.	Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so . Why ?
Answer» Solution :Because of the small size , the ionization 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 .