Actinide
Categories: Periodic table | Actinides
| Atomic No. | Name | Symbol |
|---|---|---|
| 89 | Actinium | Ac |
| 90 | Thorium | Th |
| 91 | Protactinium | Pa |
| 92 | Uranium | U |
| 93 | Neptunium | Np |
| 94 | Plutonium | Pu |
| 95 | Americium | Am |
| 96 | Curium | Cm |
| 97 | Berkelium | Bk |
| 98 | Californium | Cf |
| 99 | Einsteinium | Es |
| 100 | Fermium | Fm |
| 101 | Mendelevium | Md |
| 102 | Nobelium | No |
| 103 | Lawrencium | Lr |
The actinide series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table with atomic numbers 89 - 103. The actinide series is named after actinium. All actinides are f-block elements except lawrencium. There are also alternative arrangements which do not include either actinum or lawrencium in the actinide series. Actinides have chemically similar characteristics to the elements of the lanthanide series, and to scandium and yttrium, but actinides are all radioactive. The actinides with higher atomic numbers are not found in nature and have short half-lives.
The actinides are typically placed below the main body of the periodic table, in the manner of a footnote. The full-width version of the periodic table shows the position of the actinides more clearly.
| Standard table | Vertical table | Table with names | Names and atomic masses (large) | Names and atomic masses (small) | Names and atomic masses (text only) | Inline F-block | Elements to 218 | Electron configurations | Metals and non metals | Table by blocks |
| Lists of Elements |
| Name | Atomic symbol | Atomic number | Boiling point | Melting point | Density | Atomic mass
|
| Groups: 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 |
| Periods: 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 |
| Series: Alkalis - Alkaline earths - Lanthanides - Actinides - Transition metals - Poor metals - Metalloids - Nonmetals - Halogens - Noble gases |
| Blocks: s-block - p-block - d-block - f-block - g-block |
ar:أكتينيد
ca:Actínid de:Actinoide et:Aktinoid es:Actínido eo:Aktinoido fr:Actinide ko:악티늄 계열 it:Attinidi he:אקטיניד lt:Aktinoidai nl:Actinide no:Aktinoider nn:Aktinid ja:アクチノイド pl:Aktynowce pt:Actinídio ru:Актиноиды fi:Aktinoidi th:แอกทิไนด์ tr:Aktinit zh:锕系元素