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  4. Which pair of elements has maximum electronegativity difference?

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Q. Which pair of elements has maximum electronegativity difference?

AIIMSAIIMS 2019Classification of Elements and Periodicity in Properties

Solution:

Among Li & Na, Na is more electropositive
Among F, Cl & Br, F is most electronegative.
So, Na & F will have maximum electronegativity difference.
EN value =$\quad$$\quad$ $\begin{matrix}F&CI&Br&I&Li&Na\\ 4&3&2.8&2.5&1&0.9\end{matrix}$