For what reason is the element Th included in | vedclass

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(C) The element $Th$ (Thorium,atomic number $90$) is classified as an $f$-block element because its valence electrons enter the $5f$ orbital in its io

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Based on chemical properties

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(C) The element $Th$ (Thorium,atomic number $90$) is classified as an $f$-block element because its valence electrons enter the $5f$ orbital in its ions or based on the periodic table classification where it is placed in the actinoid series. Although the ground state electronic configuration of neutral $Th$ is $[Rn] 6d^2 7s^2$,it is chemically grouped with the actinoids due to its chemical properties and the availability of $5f$ orbitals in its compounds.

For what reason is the element $Th$ included in the $f$-block?

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