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). Five actinides have been found in nature: thorium, protoactinium, uranium, neptunium, and plutonium. Side by Side Comparison – Actinides vs Lanthanides in Tabular Form 5. The actinide series is much different. All of the others have only been artificially made in … Actinides occur between Groups 3 and 4 in Period 7 of the periodic table.All elements in this family are radioactive (that is, they spontaneously release subatomic particles or energy as their nuclei decay). Actinides. All elements in this family are radioactive (that is, they spontaneously release subatomic particles or energy as their nuclei decay). are actinides found free in nature? The 5 f sublevel is in the process of being filled. 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. Only one element in the series is radioactive. The atomic number of these elements range from 89 to 103 while the atomic masses range from 227 to 262g/mol. The lanthanide series can be found naturally on Earth. on 5f. 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. What are Actinides 3. The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. Actinides are a series of radioactive elements, which are metals. Ac is not actually a part in this group of element all are radioactive. Summary. What are Lanthanides 4. The actinides are all radioactive elements and only the first four have been found naturally on Earth. The actinides are the 14 elements from thorium (atomic number 90) to lawrencium (atomic number 103). Actinide Series of Metals There are two rows under the periodic table: the lanthanide and actinide series. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table. Actinides A class of very heavy radioactive nuclei. what are two other characteristics of actinides? There are 15 elements in the Actinide series. The Actinide series contains elements with atomic numbers 89 to 103 and is the sixth group in the periodic table. what block are actinides in? Actinides represent a family of 15 elements on the periodic table in period 7. 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. 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