Exploring Students’ Level of Conceptual Understanding on Periodicity. JPAIR Multidisciplinary Research, [S. l.], v. 33, n. 1, p. 136–154, 2018. DOI: 10.7719/jpair.v33i1.609. Disponível em: https://philair.ph/index.php/jpair/article/view/609.. Acesso em: 2 may. 2024.