18+ Actinide Series Elements. The elements belonging to this series has an atomic mass ranging from 227g/mol to 262g/mol. Actinides concept the actinides (sometimes called actinoids) occupy the bottom line of the periodic table 1—a row of elements but there is more that distinguishes the actinides, a group of 14 elements along with the transition metal actinium.
The two rows that are generally placed underneath the main periodic table are called the lanthanide series and the.
The lanthanide and actinide series make up the inner transition metals. Of the actinide series of elements, all except actinium, thorium, protactinium, and uranium are considered to be synthetic elements because they are not found in nature in appreciable amounts. Scientists have long employed lanthanide elements in the design of materials with extraordinary magnetic properties, including… expand. The series always includes the 14 elements with atomic numbers 90 through 103.