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Asked by Vandana Last Modified
Answer 
Harshit Bhardwaj
The distance between the valence electron and the nucleus is less in sodium than potassium. So sodium has a greater electrostatic force between nucleus and valence electrons which doesn't let it lose electrons easily. Whereas, in potassium, due to the weaker electrostatic force than sodium, it can lose electrons easily. So as the atomic size increases down the alkali group, the electrostatic force becomes weaker and reactivity increases.
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(a) Na (b) K (c) Rb (d) Cs
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