Identify the pair of elements with the highest and lowest electronegativity respectively
Identify the pair of elements with the highest and lowest electronegativity respectively
$\mathrm{K}$ and $\mathrm{Rb}$
I and F
$\mathrm{F}$ and $\mathrm{Fr}$
Fr and $\mathrm{Li}$
Solution
Fluorine (F) is the element with highest electronegativity, lying at the extreme right in the second period.
Francium (Fr) is the most electropositive or least electronegative element, lying at the bottom left of the periodic table.