An Energy Level with Principal Quantum Number n=0 Exists in a Hydrogen Atom. London Journal of Research In Science: Natural and Formal, [S. l.], v. 23, n. 2, p. 65–79, 2023. Disponível em: https://journalspress.uk/index.php/LJRS/article/view/384. Acesso em: 2 feb. 2026.