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The least electronegative elements are usually the alkali metals, while oxygen and fluorine are among the most electronegative elements. Electronegativities generally increase diagonally across the periodic table.
The least electronegative elements are found towards the bottom left of the periodic table and are generally the alkali metals with values around 0.7-1.0 on the Pauling scale.
Hydrogen and the halogens are typically more electronegative compared to the alkali metals, with elements like oxygen (3.5) and fluorine (4.0) being the most electronegative at the upper right of the periodic table.
Electronegativities increase diagonally from the lower left to the upper right of the periodic table, except for some unique cases like tungsten (2.4) and gold (2.5) at the bottom of the transition series.
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