(A) The element with $Z=120$ is a hypothetical element with the $IUPAC$ name $\text{unbinilium}$.Its electronic configuration is $[Og] 8s^2$,where $[O

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(A) The element with $Z=120$ is a hypothetical element with the $IUPAC$ name $\text{unbinilium}$.Its electronic configuration is $[Og] 8s^2$,where $[Og]$ represents the configuration of Oganesson $(Z=118)$.Since it has two electrons in its outermost $s$-orbital $(8s^2)$,it belongs to group $2$ of the $s$-block in the periodic table.Therefore,option $(A)$ is the correct answer.