Grundstoffer i periode 7
Periode 7 indeholder alle 15 actinider plus de supertunge syntetiske grundstoffer op til oganesson. De fleste er radioaktive, og mange findes kun i mikrogrammængder skabt i partikelacceleratorer.
Bladr efter
| Nr | Symbol | Grundstof | Atomvægt (u) | Massefylde (g/cm³) | Smeltepunkt (°C) | Kogepunkt (°C) | Electronegativity | Opdaget |
|---|---|---|---|---|---|---|---|---|
| 87 | Fr | Francium | 223 | 1.87 | 26.85 | 676.85 | 0.79 | 1939 |
| 88 | Ra | Radium | 226 | 5.5 | 959.85 | 1736.85 | 0.9 | 1898 |
| 89 | Ac | Actinium | 227 | 10 | 1226.85 | 3226.85 | 1.1 | 1902 |
| 90 | Th | Thorium | 232.038 | 11.724 | 1749.85 | 4787.85 | 1.3 | 1829 |
| 91 | Pa | Protactinium | 231.036 | 15.37 | 1567.85 | 4026.85 | 1.5 | 1913 |
| 92 | U | Uran | 238.029 | 19.1 | 1132.15 | 4130.85 | 1.38 | 1789 |
| 93 | Np | Neptunium | 237 | 20.45 | 638.85 | 4173.85 | 1.36 | 1940 |
| 94 | Pu | Plutonium | 244 | 19.816 | 639.35 | 3231.85 | 1.28 | 1940 |
| 95 | Am | Americium | 243 | 12 | 1175.85 | 2606.85 | 1.13 | 1944 |
| 96 | Cm | Curium | 247 | 13.51 | 1339.85 | 3109.85 | 1.28 | 1944 |
| 97 | Bk | Berkelium | 247 | 14.78 | 985.85 | 2626.85 | 1.3 | 1949 |
| 98 | Cf | Californium | 251 | 15.1 | 899.85 | 1469.85 | 1.3 | 1950 |
| 99 | Es | Einsteinium | 252 | 8.84 | 859.85 | 995.85 | 1.3 | 1952 |
| 100 | Fm | Fermium | 257 | - | 1526.85 | - | 1.3 | 1952 |
| 101 | Md | Mendelevium | 258 | - | 826.85 | - | 1.3 | 1955 |
| 102 | No | Nobelium | 259 | - | 826.85 | - | 1.3 | 1966 |
| 103 | Lr | Lawrencium | 262 | - | 1626.85 | - | 1.3 | 1961 |
| 104 | Rf | Rutherfordium | 261 | 23.2 | 2126.85 | 5526.85 | - | 1969 |
| 105 | Db | Dubnium | 268 | 29.3 | - | - | - | 1970 |
| 106 | Sg | Seaborgium | 269 | 35 | - | - | - | 1974 |
| 107 | Bh | Bohrium | 270.133 | 37.1 | - | - | - | 1981 |
| 108 | Hs | Hassium | 269 | 40.7 | -147.15 | - | - | 1984 |
| 109 | Mt | Meitnerium | 277.154 | 37.4 | - | - | - | 1982 |
| 110 | Ds | Darmstadtium | 281 | 34.8 | - | - | - | 1994 |
| 111 | Rg | Røntgenium | 281 | 28.7 | - | - | - | 1994 |
| 112 | Cn | Copernicium | 285 | 23.7 | - | 3296.85 | - | 1996 |
| 113 | Nh | Nihonium | 286 | 16 | 426.85 | 1156.85 | - | 2003 |
| 114 | Fl | Flerovium | 289 | 14 | 66.85 | 146.85 | - | 1998 |
| 115 | Mc | Moscovium | 288 | 13.5 | 396.85 | 1126.85 | - | 2003 |
| 116 | Lv | Livermorium | 293 | 12.9 | 435.85 | 811.85 | - | 2000 |
| 117 | Ts | Tennessin | 294 | 7.17 | 449.85 | 609.85 | - | 2009 |
| 118 | Og | Oganesson | 294 | 4.95 | - | 76.85 | - | 2002 |