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What is the maximum number of emission lines when the excited electron of a H-atom in n = 6 drops to the ground state?

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What is the maximum number of emission lines when the excited electron of a H-atom in n = 6 drops to the ground state?

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Number of lines produced when an electron from nth shell drops to ground state =  n(n-1)/ 2

Now according to question lines produced when an electron drops from 6th shell to ground state

= 6(6-1) / 2 = 15

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