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(C) Alkali metals have the lowest first ionization energy $(I.E.)$ in their respective periods.In the given graph,the points $S$ and $Q$ represent alk

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$S$

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(C) Alkali metals have the lowest first ionization energy $(I.E.)$ in their respective periods.In the given graph,the points $S$ and $Q$ represent alkali metals because they show the minimum values of $I.E.$Since the graph plots $I.E.$ against atomic number,the point $S$ appears before $Q$ on the atomic number axis.Therefore,$S$ represents the alkali metal with the least atomic number among the given options.

In the given graph,which point represents an alkali metal with the least atomic number?

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