Question

Be and mg do not give colour to flame whereas other alkaline earth metal do so

Answer 1

Answer:

Explanation:

Be and Mg have smallest sizes amongst the alkaline earth metals.

Owing to their small sizes,they have larger effective nuclear charge.

Since,the outer electrons remain strongly attracted to nucleus,so large amount of energy is required for excitation of these electrons.This energy is not provided easily in flame test,so they don't give positive flame test

Answer 2

Answer:

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.

Explanation:

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