The increasing order of electronegativity is:

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(A) The electronegativity of elements generally increases across a period from left to right and decreases down a group. Comparing the given elements:

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$Bi < P < S < Cl$

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(A) The electronegativity of elements generally increases across a period from left to right and decreases down a group. Comparing the given elements: $Bi$ (Bismuth) is in Group $15$,Period $6$. $P$ (Phosphorus) is in Group $15$,Period $3$. $S$ (Sulfur) is in Group $16$,Period $3$. $Cl$ (Chlorine) is in Group $17$,Period $3$. Since $Bi$ is at the bottom of Group $15$,it has the lowest electronegativity. In Period $3$,the order of electronegativity is $P Therefore,the overall increasing order is $Bi < P < S < Cl$.

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