Actinides
Periodic table of D.I. Mendeleev, the names and properties of chemical elements.
| Number | Atomic mass | Name | Group | Period | Latin name | Family | Year of discovery | |
|---|---|---|---|---|---|---|---|---|
| 89 | Ac | [227,0278] | Актиний | 7 | Actinium | Actinide | 1899 | |
| 90 | Th | 232,03806 | Торий | 7 | Thorium | Actinide | 1829 | |
| 91 | Pa | [231,03588] | Протактиний | 7 | Protactinium | Actinide | 1917 | |
| 92 | U | 238,02891 | Уран | 7 | Uranium | Actinide | 1789 | |
| 93 | Np | [237,0482] | Нептуний | 7 | Neptunium | Actinide | 1940 | |
| 94 | Pu | [244,0642] | Плутоний | 7 | Plutonium | Actinide | 1940 | |
| 95 | Am | [243,0614] | Америций | 7 | Americium | Actinide | 1944 | |
| 96 | Cm | [247,0703] | Кюрий | 7 | Curium | Actinide | 1944 | |
| 97 | Bk | [247,0703] | Берклий | 7 | Berkelium | Actinide | 1949 | |
| 98 | Cf | [251,0796] | Калифорний | 7 | Californium | Actinide | 1950 | |
| 99 | Es | [252,0829] | Эйнштейний | 7 | Einsteinium | Actinide | 1952 | |
| 100 | Fm | [257,0951] | Фермий | 7 | Fermium | Actinide | 1952 | |
| 101 | Md | [258,0986] | Менделевий | 7 | Mendelevium | Actinide | 1955 | |
| 102 | No | [259,1009] | Нобелий | 7 | Nobelium | Actinide | 1958 | |
| 103 | Lr | [260,1053] | Лоуренсий | 3 | 7 | Lawrencium | Actinide | 1961 |