solution:

The valence electrons get eager to a higher energy level when a basic earth metal is warmed.

It transmits energy which has a place with the apparent locale when this invigorated electron returns to its energy level which is low. The tone is seen here. The electrons are emphatically bound in the beryllium and magnesium. The energy needed to energize these electrons is exceptionally high. At the point when the electron returns to its unique position, the energy delivered doesn’t fall in the apparent area. Thus, no shading is found in the fire.