Question

Alkine earth metals which dont impart color to flame

Answer 1

Beryllium and magnesium are the Alkine earth metals which dont impart color to flame

Answer 2

Beryllium and magnesium atoms are smaller in size and their electrons are strongly bound to the nucleus. They need large amounts of energy for excitation of electrons to higher energy levels which is not available in the bunsen flame. So they do not impart colour to the flame.

Hope this will help you!!!