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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
The energy required to remove both electrons from the helum atom in its ground state is 79 ev. how much energy 1s required to 1onize helium (that is to remove o
The energy required to remove both electrons from the helum atom in its ground state is 79 eV. How much energy 1S required to 1onize helium (that is to remove one electron)? (A) 24.6 eV (B) 39.5 eV (C) 54.4 eV (D) 79 eV
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Ruby negi
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use formula E=-13.6*(Z^2)/n^2, where Z=atomic no and n=energy level. So E=-13.6*(2^2)/(1*1)=54.4.. so option is c
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Abhishek singh
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Removing first electron from helium is harder(because of stable configuration) than removing second electron. That's why ionisation energy will ge greater than half the given energy. Hence option C is correct.
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Somnath Best Answer
Ionization energy = Energy reqired to remove both electrons - ground state energy of He+ atom. See the attached file for full solution.