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 $D$.

Similar Questions

Which of the following is a false statement?

The atomic numbers of elements $A, B, C$ and $D$ are $Z-1, Z, Z+1$ and $Z+2$,respectively. If $B$ is a noble gas,choose the correct statements from the following:
$(1)$ $A$ has high electron affinity
$(2)$ $C$ exists in $+2$ oxidation state
$(3)$ $D$ is an alkaline earth metal

Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However,oxygen has lower ionisation enthalpy than nitrogen. Explain.

Identify the incorrect statement from the following:

Which of the following sequences represents the atomic numbers of only representative elements?

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