Indre overgangs-grundstoffer
Cerium
58
Praseodymium
59
Neodymium
60
Promethium
61
Samarium
62
Europium
63
Gadolinium
64
Terbium
65
Dysprosium
66
Holmium
67
Erbium
68
Thulium
69
Ytterbium
70
Lutetium
71
Thorium
90
Protactinium
91
Uranium
92
Neptunium
93
Plutonium
94
Americium
95
Curium
96
Berkelium
97
Californium
98
Einsteinium
99
Fermium
100
Mendelevium
101
Nobelium
102
Lawrencium
103
Periodisk System
Sprog
Hent