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(D) To determine the block of an element,we look at the subshell in which the last electron enters:$Z = 72$ is Hafnium $(Hf)$,which has the electronic

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None of the above

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(D) To determine the block of an element,we look at the subshell in which the last electron enters:$Z = 72$ is Hafnium $(Hf)$,which has the electronic configuration $[Xe] 4f^{14} 5d^2 6s^2$. It belongs to the $d-$block.$Z = 91$ is Protactinium $(Pa)$,which has the electronic configuration $[Rn] 5f^2 6d^1 7s^2$. It belongs to the $f-$block.$Z = 85$ is Astatine $(At)$,which has the electronic configuration $[Xe] 4f^{14} 5d^{10} 6s^2 6p^5$. It belongs to the $p-$block.Since none of the options $A$,$B$,or $C$ correctly match the element to its block,the correct answer is $D$.

Which of the following statements regarding the block classification of elements with atomic numbers $(Z)$ is correct?

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