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Actinides

15 elements

Alkali Metals 6 Alkaline Earth Metals 6 Transition Metals 38 Post-transition Metals 11 Metalloids 7 Reactive Nonmetals 7 Halogens 6 Noble Gases 7 Lanthanides 15 Actinides 15

89 Ac Actinium 227.028 90 Th Thorium 232.038 91 Pa Protactinium 231.036 92 U Uranium 238.029 93 Np Neptunium 237.048 94 Pu Plutonium 244.064 95 Am Americium 243.061 96 Cm Curium 247.07 97 Bk Berkelium 247.07 98 Cf Californium 251.08 99 Es Einsteinium 252.083 100 Fm Fermium 257.095 101 Md Mendelevium 258.098 102 No Nobelium 259.101 103 Lr Lawrencium 266.12