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The actinide series encompasses the 14 chemical elements that lie between actinium and nobeliummendelevium nobelium lawrencium Yb No Full table Known properties Name, Symbol, NumberNobelium, No, 102 Chemical series Actinides Period, Block 7 , f Appearance unknown; probably metallic, silvery white or gray Atomic weight 1 E-25 kg|[259] u]] Electron c on the periodic tableThe periodic table of the chemical elements is a tabular display of the known chemical elements. The elements are arranged by electron structure so that many chemical properties vary regularly across the table. Each element is listed by its atomic number with atomic numbers between 89 and 102 inclusive. They are similar in characteristics to the elements of the lanthanideThe lanthanide series is the 14 rare earth chemical elements which lie between lanthanum and ytterbium on the periodic table. That is, they have atomic numbers between 57 and 70 inclusive. Below them are the actinides. Lanthanides are elements in which th series. The actinides with the higher atomic numbers are not found in nature and have short half-livesThis article describes the scientific meaning. For the computer game, see Half-Life''. For a quantity subject to exponential decay, the half-life is the time required for the quantity to fall to half of its initial value. Quantities subject to exponential.
The actinides are typically placed below the main body of the periodic table, in the manner of a footnote. The full-width version of the periodic table shows the position of the actinides more clearly.
Chemical element groups
