If fluorine gains one more electron, the outermost p orbitals are completely filled (resulting in a. Its electron configuration is 1s 2 2s 2 2p 5. ![]() Therefore, fluorine has the highest electronegativity of all of the elements, indicated by its position on the periodic table. These are the metalloids (or semimetals), elements that have some of the chemical properties of both nonmetals and metals. Electronegativity increases across a period, and decreases down a group. In between the metals and nonmetals, along the heavy diagonal line running from B to At is a group of elements with intermediate electronegativities (χ ~ 2.0). And this scale is known as Pauling electronegativity scale.) Let’s see few Periodic tables of elements with Electronegativity values labeled on it. In contrast, elements with a low electronegativity (\(\chi \le 1.8\)) have electron affinities that have either positive or small negative values and small ionization potentials, so they are generally metals and good electrical conductors that tend to lose their valence electrons in chemical reactions (i.e., they are reductants). Linus Pauling was a scientist who designed a scale of electronegativity that ranks the elements with respect to each other. ![]() Many scientists worked on the problem of organizing the elements, but Dmitri Mendeleev published his first version of the periodic table in 1869, and is most often credited as its. ![]() The electronegativity value is 3.98 and so the cesium is least electronegative element thus, electronegativity value is 0.79, and therefore it is said that Cesium is the most electropositive element while Fluorine is the least electropositive element. \)) have very negative affinities and large ionization potentials, so they are generally nonmetals and electrical insulators that tend to gain electrons in chemical reactions (i.e., they are oxidants). The periodic table’s arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius. Fluorine has the highest electronegativity element on periodic table.
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