Dysprosium (Dy) belongs to the Lanthanide series, it has an atomic number of 66
Nobel gas electron configuration can be represented in terms of Xenon (Xe) which in turn has an atomic number 54
Dy = [Xe] 4f¹⁰6s²
Americium (Am) belongs to the actinide series, it has an atomic number of 95
Nobel gas electron configuration can be represented in terms of Radon(Rn) which in turn has an atomic number 86
Am = [Rn] 5f⁷7s²