Question

Although thorium does not have any electron in the 5f orbital, yet it is considered to be a f-block element. Why?​

Answer 1

Explanation:

Metallic thorium does have some f-character and this is thought to be the reason why it has an FCC crystalline structure, rather than the BCC structure of Ti, Zr, and Hf. Further, the +3 ion of Th has a configuration of [Rn]5f^1, indicating the 5f orbitals are low-lying and available for chemistry.

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Answer 2

Answer:

Metallic thorium does have some f-character and this is thought to be the reason why it has an FCC crystalline structure, rather than the BCC structure of Ti, Zr, and Hf. Further, the +3 ion of Th has a configuration of [Rn]5f^1, indicating the 5f orbitals are low-lying and available for chemistry.