Choose the correct statement.

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(D) Statement $A$ is incorrect because thorium ($Th$,$Z=90$) has the electronic configuration $[Rn] 6d^2 7s^2$. Although it is often placed in the $f$

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None of these

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(D) Statement $A$ is incorrect because thorium ($Th$,$Z=90$) has the electronic configuration $[Rn] 6d^2 7s^2$. Although it is often placed in the $f$-block due to its chemical properties resembling actinides,it does not have electrons in the $f$-subshell in its ground state.Statement $B$ is incorrect because the modern periodic table is based on the increasing order of atomic number,not atomic mass.Statement $C$ is incorrect because ionization energy (energy required to remove an electron) is always positive,while electron affinity (energy released when an electron is added) is typically defined such that the magnitude of ionization energy is significantly higher than electron affinity for most elements.Therefore,the correct answer is $D$.

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