Beryllium and magnesium don t give colour to flame

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Question 10.11 Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

Class XI The s-Block Elements Page 305

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As we know, Be and Mg are small in size and due to their small size, effective nuclear charge will be high .it means nuclear bind their electrons more strongly. Therefore they require high excitation energy and are not excited by Bunsen flame. While other alkaline earth metals impart a characteristics color to the flame, due to easy excitation of electrons to higher energy levels.

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