Ionization Energy of Helium Atom | 24.6 eV

In summary, the energy required to remove both electrons from a helium atom is related to the first ionization energy by the equation IP2 = IP1*Z2. This equation can be applied because He+ is a hydrogen-like species and Bohr's model is applicable to it. However, Bohr's model is not applicable to the initial He atom with two electrons. The source of this equation is unknown, but it can be interpreted as the energy required to remove the second electron from He+. This interpretation results in the correct value for IP2, which is twice the value of IP1.
  • #1
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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  • #2
He+ is a hydrogen like species as it has one electron.So Bohr's model is applicable on it.
 
  • #3
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?
 
  • #4
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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  • #5
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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Related to Ionization Energy of Helium Atom | 24.6 eV

1. What is the definition of ionization energy?

Ionization energy is the amount of energy required to remove an electron from an atom or molecule, resulting in the formation of a positive ion.

2. How is ionization energy measured?

Ionization energy is typically measured in units of electron volts (eV) or kilojoules per mole (kJ/mol). It is measured by bombarding atoms with high-energy particles and measuring the amount of energy required to remove an electron.

3. What is the ionization energy of a helium atom?

The ionization energy of a helium atom is 24.6 eV, which is the amount of energy required to remove an electron from a helium atom in its ground state.

4. Why does helium have a higher ionization energy than other elements?

Helium has a higher ionization energy than other elements because it has a full outer electron shell, making it more stable. This means that it takes more energy to remove an electron from helium compared to other elements with incomplete outer shells.

5. How does ionization energy affect the reactivity of helium?

The high ionization energy of helium makes it relatively unreactive and nonreactive in most chemical reactions. This is because it takes a lot of energy to remove an electron from helium, making it difficult for it to form bonds with other elements.

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