Helium4.0026
Neon20.1797
Chlorine35.453
Argon39.948
Argon83.80
Iodine126.904
Xenon131.293
Astatine[210]
Radon[222]
Lanthanum138.905
Cerium140.116
Praseodymium140.907
Neodymium144.242
Promethium[145]
Samarium150.36
Europium151.36
Gadolinium157.25
Terbium158.925
Dysprosium162.500
Holmium164.930
Erbium167.259
Thulium168.934
Ytterbium173.04
Lutetium174.967
Actinium[227]
Thorium232.038
Protactinium232.038
Uranium238.028
Neptunium[237]
Plutonium[244]
Americium[243]
Curium[247]
Berkelium[247]
Californium[251]
Einsteinium[257]
Fermium[257]
Mendelevium[258]
Nobelium[259]
Lawrencium[262]