Question

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Why is Potassium considered lighter than Sodium?
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Answer 1

K is more reactive but it is lighter than sodium it can also be cut easily being a metal .

Answer 2

This happens because of there is an abnormal increase in atomic size and atomic volume as we move from sodium to potassium. When we move from Na to K, effect of increase in volume is more pronounced as compared to effect of increase in atomic mass. Due to this potassium is less dense than sodium.