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(A) Electronegativity $(EN)$ generally decreases down a group and increases across a period.For $K$ and $Rb$,$K$ is above $Rb$ in Group $1$,so $EN(K)

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$Zr, Hf$

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(A) Electronegativity $(EN)$ generally decreases down a group and increases across a period.For $K$ and $Rb$,$K$ is above $Rb$ in Group $1$,so $EN(K) > EN(Rb)$.For $Cl$ and $S$,$Cl$ is to the right of $S$ in Period $3$,so $EN(Cl) > EN(S)$.For $Zr$ and $Hf$,due to lanthanoid contraction,the $EN$ of $Hf$ $(1.3)$ is slightly higher than that of $Zr$ $(1.22)$.Therefore,the pair where the first element has lower $EN$ than the second is $Zr, Hf$.

In which of the following pairs of elements is the electronegativity of the first element less than that of the second element?

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