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NEET UG CHEMISTRY MCQ: STRUCTURE OF ATOM
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In H atom, the electron is de-excited from 5th shell to 1st shell. How many different lines may appear in line spectrum?
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Correct option: C
10
Option C (10) is correct because the number of spectral lines when an electron de-excites from nth shell to the ground state is given by n(n-1)/2. For n=5, it is 5(5-1)/2 = 10.
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S-II: The element helium was discovered in the sun by spectroscopic method. In which one of the following, the number of protons is greater than number of neutrons but number of protons is less than the number of electrons?