In the given graph,which point represents an | vedclass

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(C) The graph shows the variation of the $1^{st}$ Ionisation Energy $(I.E.)$ with respect to atomic number for elements in the $3^{rd}$ period.Alkali

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$S$

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(C) The graph shows the variation of the $1^{st}$ Ionisation Energy $(I.E.)$ with respect to atomic number for elements in the $3^{rd}$ period.Alkali metals have the lowest $1^{st}$ $I.E.$ in their respective periods because they have a stable noble gas configuration after losing one electron.In the $3^{rd}$ period,the alkali metal is Sodium ($Na$,atomic number $11$).Looking at the graph,the point $S$ represents the element with the lowest $1^{st}$ $I.E.$ in the sequence,which corresponds to the alkali metal of the $3^{rd}$ period.

In the given graph,which point represents an alkali metal with the least atomic number (Period number $= 3$)?

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