2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/94078A simple expression for a ground state energy for a two-electron atom is derived. For this, assumption based upon the Niels Bohr ''old'' quantum mechanics idea about electron correlation in a two-electron atom is exploited. Results are compared with experimental data and theoretical results based on a variation approach.LaTeX 5 pages, 1 figure, 1 tableQuantum PhysicsAtomic PhysicsPhysics EducationA simple formula for ground state energy of a two-electron atomtext