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Thorium, atom no. 90, just after Actinium (89)

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All of the actinides are?

radioactive elements that belong to the periodic table group of actinides. They have increasing atomic numbers starting from actinium (Z=89) to lawrencium (Z=103). Actinides are often used in nuclear reactors and are known for their radioactive properties.


Which two actinides occur naturally?

Uranium and thorium are the two actinides that occur naturally in the Earth's crust. They are found in low concentrations and have important roles in various nuclear reactions and processes.


What are Lanthanides and Actinides?

Elements. The Lanthanides are: Atomic No.575859606162636465666768697071NameLaCePrNdPmSmEuGdTbDyHoErTmYbLu The Actinides are:Atomic No.8990919293949596979899100101102103NameAcThPaUNpPuAmCmBkCfEsFmMdNoLr


Scientists are uncertain about the electronic structures of the actinides because?

the actinides have complex atomic structures due to the presence of inner 5f orbitals, leading to difficulties in predicting their electronic configurations accurately. Additionally, the actinides exhibit multiple oxidation states, making it challenging to determine the precise electron arrangements in different chemical environments. The influence of both relativistic effects and electron correlations further complicates the understanding of actinide electronic structures.


What is the first element of the actinides?

The first element in the actinide series is actinium , a chemical element in the periodic table that has the symbol Ac and atomic number 89.The actinide (or actinoid) series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table , with atomic numbers 89-103.The actinides get their name from the first element in the series , actinium.