Ionization Energy of Helium Atom | 24.6 eV

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Homework Help Overview

The discussion revolves around the ionization energy of a helium atom, specifically questioning the relationship between the first and second ionization energies. Participants are examining the applicability of the Bohr model to helium and its ion, He+.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the first ionization energy (IP1) and the second ionization energy (IP2), questioning the validity of using the Bohr model for helium. There are discussions about interpreting IP2 in relation to He+ and the implications of using the equation IP2 = IP1 * Z2.

Discussion Status

The discussion is ongoing, with participants providing differing viewpoints on the applicability of the Bohr model and the interpretation of the ionization energies. Some guidance has been offered regarding the interpretation of the energies, but no consensus has been reached.

Contextual Notes

Participants note that the initial helium atom has two electrons, which complicates the application of the Bohr model. There is also mention of potential discrepancies in calculated values if the equation is applied without proper context.

physicsmaths1613
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Homework Statement


The energy required to ionize a helium atom is 24.6 eV. The energy required to remove both the electrons from He atom would be?

The Attempt at a Solution


My textbook says-
IP1= 24.6 eV
IP 2= IP1*Z2
How can they relate the first ionization energy to the second one? The Bohr's atom can be used only for Hydrogen like species and He atom is not Hydrogen like, only it's ion is. How did they relate it?
 
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He+ is a hydrogen like species as it has one electron.So Bohr's model is applicable on it.
 
harsh_sinha said:
He+ is a hydrogen like species as it has one electron.So Bohr's model is applicable on it.
But what about intial He atom with 2 electrons?
 
physicsmaths1613 said:
But what about intial He atom with 2 electrons?
Bohr's model is not applicable for He atom.Besides if we use this equation to calculate IP2 then the result would be twice of the actual value.
It would be great if you share the source of this equation.
 
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physicsmaths1613 said:
IP 2= IP1*Z2
I can only get the right answer from that by interpreting the IP2 as the energy to remove the second electron from He+, and the IP1 as the energy required to ionise H (which makes sense).
 
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