Question

Why is Na less reactive than K?

Answer 1

because k has less boiling point.

Answer 2

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Reactivity of the metals is described as The tendency to complete it's octet or duplet{ complete it's outermost shell}.

The valency of Na is 1.

And valency of K is also 1.

But the number of shells K has is more than of Na {K has 4 shells and Na has 3 shells}.

Therefore the distance between the nucleus and the outermost shell increases and the force of attraction between them decreases.

This leads the tendacy to lose electrons easily.

Therefore K is more reactive to than Na.

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In Simple words

K has more shells than Na and tendency to lose electrons is more .

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