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At the bottom of the periodic table is a special group of metallic radioactive elements called actinides or actinoids. These elements, usually considered ranging from atomic number 89 to atomic number 103 on the periodic table, have interesting properties, and play a key role in nuclear chemistry.
Knowing about the solubility and precipitations of actinides, help chemists understand their properties better. Not all Actinides have the same properties when it comes solubility and precipitation, but most of the Actinides have similar traits and characteristics.
All actinides form AnH 3 hydrides of black color with salt-like properties. Actinides also produce carbides with the general formula of AnC or AnC 2 ( U 2 C 3 for uranium) as well as sulfides An 2 S 3 and AnS 2 .
Actinide Properties. The actinides share common properties: All actinides elements are radioactive. They have no stable isotopes. The actinides successively fill the 5f electron sublevel. Many of these elements share properties with both d-block and f-block elements. They are silver-colored metals that are solid at room temperature and pressure.
Lanthanides and actinides are elements with unfilled \(f\) orbitals. Lanthanides are all metals with reactivity similar to group 2 elements. Actinides are all radioactive elements. Lanthanides are used in optical devices (night vision goggles), petroleum refining, and alloys.
Actinides are elements with atomic numbers ranging from 90 to 103, which come after the element Actinium. They include eleven transuranic elements, or those created artificially through nuclear reactions, as well as naturally occurring forms of thorium, protactinium, and uranium.
8.2.1: General Properties and Reactions of The Actinides The Actinide series contains elements with atomic numbers 89 to 103 and is in the sixth period and the third group of the periodic table. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table.
Characteristics of the Actinides. Most actinides will share the following properties: Each of these elements are radioactive. This means the element has no stable isotopes. The actinides are highly electropositive. Meaning they often form cations. The actinides that are classified as metals tarnish quickly in the air. Actinides are very dense ...
actinoid element, any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). As a group, they are significant largely because of their radioactivity.
Nobelium. Lawrencium (sometimes considered a transition metal yet not an actinide) History. The actinides are rare in nature, with only uranium and thorium found in more than trace amounts. So, they were discovered relatively recently compared with most other elements.