The spectrum of He ⁺ is similar to

Step-by-step solution

The spectrum of a hydrogen-like species is determined by the Rydberg formula, which depends on the atomic number Z . A hydrogen-like species is defined as an ion containing only one electron. The energy levels and spectral lines of such species are proportional to Z^2 . The He ⁺ ion has an atomic number Z = 2 and contains only one electron. Among the given options, Li ²⁺ would be a hydrogen-like species, but it is not listed. However, the question asks for a species similar to He ⁺ . The hydrogen atom H has Z = 1 a