They can form at normal pressure between room temperature and its melting point, 640 ☌.It has 6 allotropic metal forms, which makes it unusual.Pu +7 only exists under very alkaline conditions.are the most important, but compounds of the ions are well defined. The most important isotope is 239Pu because it is fissionable and has a half-life of 24,100 years, which makes it easy for chemists to study.
It is converted to NpO 2 at high temperatures.It has surface oxidation when exposed to air.It is a silvery metal, with a melting point of 637 ☌ and a boiling point of 4174 ☌.There are 15 known isotopes, only 237Np, w/ half-life of 2.14*10 6 years, is useful for chemical experiments.It was the first transuranium element to be discovered in 1940.Reacts readily with hot water to prevent substances from coming into contact in nuclear reactors.When attacked by air, yellow film then black coating develops, it is a mix of oxide and nitride.U 5+ disproportionates rapidly into a mixture of U 4+ and U 6+ in aqueous solutions.U 4+ stable in aqueous solution in the absence of air.The Pa metal is malleable, ductile, silvery, and has a melting point of about 1565 ☌.It has α-emission, so it has appropriate radiochemical precautions.231Pa has a half-life of 3.28*10 14 which allows it to make chemical study easy for it.It has been in existence longer than any other actinide.It slowly dissolves in dilute with hydrogen evolution and can be pyrophoric as a powder. It is soft enough to be scratched with a knife and melts at 1750 °. Thorium metal is bright and silvery-white and tarnishes to a dull black color when exposed to air.It has wide coordination chemistry with oxygen donor ligands.is restricted to iodides like ThI 2 and cyclopentadienyl Th(C 5H 5) 3. It forms insoluble fluoride and oxalate (Ac 2(C 2O 4) 3*10H 2O) compounds.Actinium metal is silvery solid obtained by reduction of oxide, fluoride or chloride w/ Group 1 metals and oxidized rapidly in moist air.227Ac is strongly radioactive and so are its decay components.It does not have absorption in the UV visible region between 400-1000nm.These examples illustrate their importance in understanding key concepts in nuclear chemistry and related topics. -mass number of the longest living isotope is given when the element has no stable nucleotides.Īctinides have been crucial in understanding nuclear chemistry and have provided valuable usage today, such as nuclear power.
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