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2014-10-22T11:47:28+05:30

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Potassium is more reactive than Sodium as Potassium as  a extra shell than that of Sodium which makes the electron on the outermost shell of potassium easily dissociated rather than that of Sodium. 
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2014-10-22T12:44:24+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Across the periodic table of elements, we have trends in acidity, basic nature reactivity, metallic, atom size and non-metallic character etc.

Across a period the metallic character decreases as we move from left to right. In a group the metallic character increases when we move from the top to bottom.  The electron affinity reduces as we move down the group.  

Potassium is the next element after sodium in the sodium group.  So radius of potassium is more. The ionization energy is less.  So electrons are more loosely bound in potassium.  So potassium is more metallic and reactive than sodium.

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