All of the others have only been artificially made in … Actinides is a set of elements in the periodic table with the atomic numbers ranging from 90 to 103. What are Actinides 3. only the first four elements (Th, Pa, U, Np) are found naturally, the rest are lab-made. They are all radioactive and some are not found in nature. Five actinides have been found in nature: thorium, protoactinium, uranium, neptunium, and plutonium. What are Lanthanides 4. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table. There are 15 elements in the Actinide series. What are Actinides? are actinides found free in nature? The actinide series is much different. 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). 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. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table. Actinides. The actinides are the 14 elements from thorium (atomic number 90) to lawrencium (atomic number 103). 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 sixth group in the periodic table. Ac is not actually a part in this group of element all are radioactive. Actinides represent a family of 15 elements on the periodic table in period 7. Lanthanide and Actinide Series are both referred to as Rare Earth Metals. what are two other characteristics of actinides? Actinides are a series of radioactive elements, which are metals. All elements in this family are radioactive (that is, they spontaneously release subatomic particles or energy as their nuclei decay). Only one element in the series is radioactive. The Actinide series contains elements with atomic numbers 89 to 103 and is the third group in the periodic table. 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). Actinide Series of Metals There are two rows under the periodic table: the lanthanide and actinide series. The actinides are all radioactive elements and only the first four have been found naturally on Earth. The atomic number of these elements range from 89 to 103 while the atomic masses range from 227 to 262g/mol. The actinides (or actinoids) are the chemical elements with atomic numbers between 90 and 109 inclusively. (An atomic number indicates the number of protons in an atom.) 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