NEW TYPES OF PROBLEMS FOR DETERMINING THE RELATIVE ATOMIC MASS AND PERCENTAGE CONTENT OF ISOTOPES AND THEIR SOLUTIONS. Academicia Globe: Inderscience Research , [S. l.], v. 2, n. 04, p. 161–164, 2021. Disponível em: https://agir.academiascience.org/index.php/agir/article/view/78. Acesso em: 31 jan. 2026.