If the energy of an H-atom in the orbit is , then the energy in the orbit of a singly ionised helium — Atomic Structure Chemistry Question

💡 Solution & Explanation

Energy $E \propto Z^2$. For hydrogen $Z=1$, and for $He^+$, $Z=2$. Thus, the energy for $He^+$ will be $2^2 = 4$ times that of Hydrogen in the same orbit, i.e., $4E_n$.