![]() None of the actinides have a stable isotope. High-maintenance children are emotionally reactive, which means they usually react strongly and negatively to stress or change.All of the lanthanides have at least one stable isotope except for promethium.Both actinides and lanthanides are highly reactive with elements from the halogen group. Proactive: Creating or controlling a situation by causing something to happen rather than waiting to respond to it after it has happened.The name "actinium" comes from the Greek word "aktis" which means beam or ray.The first actinides discovered were uranium and thorium.Elements that have an atomic number greater than uranium (92) are often called "transuranium." Many of these elements are man-made under the conditions of nuclear reactors.The actinide americium is used in smoke detectors.Lanthanides are used in products such as hybrid cars, superconductors, and permanent magnets.The lanthanides and actinides are located mostly in the "f-block" of the periodic table.Interesting Facts about Lanthanides and Actinides The actinides are most known for the elements uranium and plutonium which are used in nuclear reactors and nuclear bombs. The actinides group includes mostly man-made elements with only a few exceptions such as uranium and thorium. They are named after the first element in the series, actinium. ![]() They are called the lanthanides because they exhibit similar chemical properties to lanthanum, the first element in the group.Īctinides are the 15 elements with atomic numbers from 89 to 103. A reaction will be more reactive if the energy of its transition is low. A reaction will be more reactive if the total energy of the products is less than the total energy of the reactants. They are all silvery-white metals which are often found in the same ores. Reactivity involves both the thermodynamics and kinetics of the particular chemical reaction. These 15 metals (along with scandium and yttrium) are often called the rare earth elements. The lanthanides are the elements with atomic numbers from 57 to 71. They are often called the "inner transition metals." There are thirty total elements in the lanthanides and actinides. They are the elements that are often listed below the main section of the periodic table. ![]() The lanthanides and actinides are groups of elements in the periodic table.
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