SIREGAR, S. D. Application Learning of Configuration Electron Chemical Elements. Jurnal Mantik, [S. l.], v. 5, n. 3, p. 1813-1817, 2021. Disponível em: http://ejournal.iocscience.org/index.php/mantik/article/view/1763. Acesso em: 26 oct. 2026.