Using periodic trends, arrange the following atoms in order of increasing electronegativity: Se, Cl, Mg, Na

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Electronegativity increases across a period from left to right and decreases down a group in the periodic table. Therefore, among the given elements, sodium (Na) and magnesium (Mg) are metals with lower electronegativities compared to selenium (Se) and chlorine (Cl), which are nonmetals. Na and Mg are in the same period with Na being to the left of Mg, so Na < Mg. Se and Cl are also in the same period with Se to the left of Cl, so Se < Cl. Between the metals and nonmetals, metals (Na and Mg) have lower electronegativities than nonmetals (Se and Cl), leading to the order: Na < Mg < Se < Cl.

Using Periodic Trends, Arrange the Following Atoms in Order of Increasing