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
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 energ...