COMEDK2015ChemistryStructure of Atom
Energy associated with the first orbit of He ⁺ is
Options
- A8.72 10⁻¹⁸ ~J
- B0.872 10⁻¹⁸ ~J
- C-0.872 10⁻¹⁸ ~J
- D-8.72 10⁻¹⁸ ~J
Correct answer
D. -8.72 10⁻¹⁸ ~J
Step-by-step solution
For H-like particles, aligned E_ n &= -21.78 10⁻¹⁹ n² Z ² J &= -21.78 10⁻¹⁹ 1² (2)²[ For helium, Z=2, n=1] &=-8.72 10⁻¹⁸ ~J aligned