Question

Sodium is less reactive than potassiun. Give reason

Answer 1

As potassium is larger than sodium, potassium's valence electron is at a greater distance from the attractive nucleus and is so removed more easily than sodium's valence electron. As it is removed more easily, it requires less energy, and can be said to be more reactive.

Answer 2

Explanation:

The ease with which K loses an electron is higher than the ease with which Na loses an electron. Hence, sodium is less reactive than potassium. ... This also indicates lower reactivity of sodium as compared to potassium.

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