What are Actinides? Actinide Series of Metals There are two rows under the periodic table: the lanthanide and actinide series. (An atomic number indicates the number of protons in an atom.) Lanthanide and Actinide Series are both referred to as Rare Earth Metals. Alongside the fission products found in the core of nuclear reactors there are elements known as actinides, heavy nuclei that also contribute to the radioactivity of the spent fuel.These 'transuranic' nuclei, heavier than uranium, are produced by neutron captures which do not lead to nuclear fission. Actinides are a series of radioactive elements, which are metals. Side by Side Comparison – Actinides vs Lanthanides in Tabular Form 5. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table. The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. Ac is not actually a part in this group of element all are radioactive. Actinides. are actinides found free in nature? Actinides occur between Groups 3 and 4 in Period 7 of the periodic table. The Actinide series contains elements with atomic numbers 89 to 103 and is the third group in the periodic table. All elements in this family are radioactive (that is, they spontaneously release subatomic particles or energy as their nuclei decay). All of the others have only been artificially made in … only the first four elements (Th, Pa, U, Np) are found naturally, the rest are lab-made. What are Actinides 3. Actinides A class of very heavy radioactive nuclei. As a group, they are significant largely because of their radioactivity.Although several members of the group, including uranium (the most familiar), occur naturally, most are man-made. Actinides is a set of elements in the periodic table with the atomic numbers ranging from 90 to 103. Lanthanide and Actinide Series are both referred to as Rare Earth Metals. The actinides are the 14 elements from thorium (atomic number 90) to lawrencium (atomic number 103). Actinoid element, also called actinide element, any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). what are two other characteristics of actinides? They are all radioactive and some are not found in nature. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table. All of these elements, except Actinium, Thorium, Protactinium and Uranium are only made artificially and are not found in nature. The lanthanide series can be found naturally on Earth. The actinide series is much different. The actinides are all radioactive elements and only the first four have been found naturally on Earth. There are 15 elements in the Actinide series. The 5 f sublevel is in the process of being filled. 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