Chemistry · Structure of atom

Calculate the energy required for the process \( \text{He}^+(g) \rightarrow \text{He}^{2+}(g) + e^- \), given that the ground state ionization energy of H atom is \( 2.18 \times 10^{-18} \text{ J atom}^{-1} \).

1. A
   \( 2.18 \times 10^{-18} \text{ J} \)
2. B
   \( 8.72 \times 10^{-18} \text{ J} \)
3. C
   \( 4.36 \times 10^{-18} \text{ J} \)
4. D
   \( 1.31 \times 10^{-17} \text{ J} \)