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Class 11
Chemistry
Structure of Atom
how much energy is required to ionise a h atom if...

Question:
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).

Answer:

The expression of energy is given by,

Where,

Z = atomic number of the atom

n = principal quantum number

For ionization from n1 = 5 to ,

Therefore ΔE = E2- E1 = - 21.8 X10^-19 (1/n₂²-1/n₁²)

= 21.8 X10^-19(1/n₂²-1/n₁²)

= 21.8 X10^-19 (1/5²-1/∞)

= 8.72 x 10^-20 J

For ionization from 1^st orbit, n₁= 1,

Therefore ΔE’ = 21.8x10^-19(1/1²-1/∞)

= 21.8x10^-19J

Now ΔE’/ ΔE = 21.8x10^-19 / 8.72x10^-20 = 25

Thus the energy required to remove electron from 1^st orbit is 25 times than the required to electron from 5^th orbit.

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Question:
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).

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Question: 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).

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Question:
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).