Why Lithium impart colour to Bunsen burner flame and Beryllium doesn't.Even though Beryllium is bigger in size than lithium?
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Be and Mg have small atomic size and high ionization energies when compared to other alkaline earth metals. The energy of flame is not sufficient to excite the electrons of Be and Mg to higher energy level. Hence, Be and Mg do not give any color in Bunsen flame.
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