How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionization enthalpy of H atom ( energy required to remove the electron from n =1 orbit)

NCERT Class XII
Chemistry - Main Course Book I

Chapter 2. Structure of Atom

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2015-05-30T15:21:44+05:30

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N = 5 shell O  in the atom.

Ionization energy enthalpy of Hydrogen atom Z = 1, n = 1, to remove electron from 1S orbital... = 13.6 eV

Ionization energy = E = \frac{Z^2}{n^2}*13.6\ eV=\frac{1^2}{5^2}13.6=0.544\ eV

The ionization energy is inversely proportional to the square of n... so it is 1/25 th or 4% of the ionization energy of Hydrogen atom for the electron in K orbit.
 
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