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The energy required to remove the electron from a singly ionized Helium atom is 2.2 times the energy required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is:

1. 20 eV
2. 79 eV
3. 109 eV
4. 34 eV

Correct answer: 79 eV

Solution

The energy to remove the first electron from a neutral Helium atom is approximately 24.6 eV. Since the energy required to remove the second electron from the singly ionized Helium atom is 2.2 times that, it amounts to about 54.6 eV. Adding these two values gives a total of approximately 79 eV for complete ionization.

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