What is the maximum number of emission lines

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Question 2.15 What is the maximum number of emission lines when the excited electron of an H atom in n = 6 drops to the ground state?

Class XI Structure of Atom Page 66

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Maximum Number of emission lines produced when electron from nth shell drop to the ground state = n( n - 1 )/2

actual formula for finding number of spectral line is (n₂ -n₁)(n₂ -n₁ + 1)/2
where , electrons moves from n₁ state to n₂ state


here, excited electron of an H-atom in n = 6 drops to the ground state .
so, maximum number of emission lines = 6(6-1)/2 = 6 × 5/2 = 15

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