
Elementos del bloque f
El bloque f son las dos filas largas separadas debajo: los lantánidos y actínidos. Los elementos del bloque f son en su mayoría radiactivos (en los actínidos) e importantes para imanes, láseres, combustibles nucleares y aleaciones de alta tecnología.
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| No. | Symbol | Elemento | Peso atómico (u) | Densidad (g/cm³) | Punto de fusion (°C) | Punto de ebullición (°C) | Electronegatividad | Descubridor |
|---|---|---|---|---|---|---|---|---|
| 58 | Ce | Cerio | 140.116 | 6.77 | 794.85 | 3442.85 | 1.12 | 1803 |
| 59 | Pr | Praseodimio | 140.908 | 6.77 | 934.85 | 3129.85 | 1.13 | 1885 |
| 60 | Nd | Neodimio | 144.242 | 7.01 | 1023.85 | 3073.85 | 1.14 | 1885 |
| 61 | Pm | Prometio | 145 | 7.26 | 1041.85 | 2999.85 | 1.13 | 1945 |
| 62 | Sm | Samario | 150.362 | 7.52 | 1071.85 | 1899.85 | 1.17 | 1879 |
| 63 | Eu | Europio | 151.964 | 5.264 | 825.85 | 1528.85 | 1.2 | 1896 |
| 64 | Gd | Gadolinio | 157.253 | 7.9 | 1311.85 | 2999.85 | 1.2 | 1880 |
| 65 | Tb | Terbio | 158.925 | 8.23 | 1355.85 | 3122.85 | 1.1 | 1843 |
| 66 | Dy | Disprosio | 162.5 | 8.54 | 1406.85 | 2566.85 | 1.22 | 1886 |
| 67 | Ho | Holmio | 164.93 | 8.79 | 1460.85 | 2599.85 | 1.23 | 1878 |
| 68 | Er | Erbio | 167.259 | 9.066 | 1528.85 | 2867.85 | 1.24 | 1843 |
| 69 | Tm | Tulio | 168.934 | 9.32 | 1544.85 | 1949.85 | 1.25 | 1879 |
| 70 | Yb | Iterbio | 173.045 | 6.9 | 823.85 | 1195.85 | 1.1 | 1878 |
| 71 | Lu | Lutecio | 174.967 | 9.841 | 1651.85 | 3401.85 | 1.27 | 1907 |
| 90 | Th | Torio | 232.038 | 11.724 | 1749.85 | 4787.85 | 1.3 | 1829 |
| 91 | Pa | Protactinio | 231.036 | 15.37 | 1567.85 | 4026.85 | 1.5 | 1913 |
| 92 | U | Uranio | 238.029 | 19.1 | 1132.15 | 4130.85 | 1.38 | 1789 |
| 93 | Np | Neptunio | 237 | 20.45 | 638.85 | 4173.85 | 1.36 | 1940 |
| 94 | Pu | Plutonio | 244 | 19.816 | 639.35 | 3231.85 | 1.28 | 1940 |
| 95 | Am | Americio | 243 | 12 | 1175.85 | 2606.85 | 1.13 | 1944 |
| 96 | Cm | Curio | 247 | 13.51 | 1339.85 | 3109.85 | 1.28 | 1944 |
| 97 | Bk | Berkelio | 247 | 14.78 | 985.85 | 2626.85 | 1.3 | 1949 |
| 98 | Cf | Californio | 251 | 15.1 | 899.85 | 1469.85 | 1.3 | 1950 |
| 99 | Es | Einstenio | 252 | 8.84 | 859.85 | 995.85 | 1.3 | 1952 |
| 100 | Fm | Fermio | 257 | - | 1526.85 | - | 1.3 | 1952 |
| 101 | Md | Mendelevio | 258 | - | 826.85 | - | 1.3 | 1955 |
| 102 | No | Nobelio | 259 | - | 826.85 | - | 1.3 | 1966 |
| 103 | Lr | Lawrencio | 262 | - | 1626.85 | - | 1.3 | 1961 |