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# Explain why is sodium less reactive than potassium

10.5 Explain why is sodium less reactive than potassium

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As we know that in alkali metals, as we go down the group the atomic size increases and also the effective nuclear charge decreases. So, therefore, the outermost electron of potassium is easily removed. Electronic configuration of $(K\rightarrow 1s^{2},2s^{2},2p^{6},3s^{2},3p^{6},4s^{1})$ and electronic configuration of sodium  (Na= $( 1s^{2},2s^{2},2p^{1}$). Hence the reactivity of sodium is less than of potassium.

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