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

Asked by Pragya Singh | 1 year ago |  62

1 Answer

Solution :-

The valence electrons get excited to a higher energy level when an alkaline earth metal is heated. It radiates energy which belongs to the visible region when this excited electron comes back to its energy level which is low. The colour is observed here. The electrons are strongly bound in the beryllium and magnesium. The energy required to excite these electrons is very high. When the electron reverts back to its original position, the energy released does not fall in the visible region. Hence, no colour is seen in the flame.

Answered by Abhisek | 1 year ago

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